material.py

import warnings # to ignore poly1d or polyfit warnings
warnings.filterwarnings('ignore')

from math import pi, sqrt

# Material properties:
# https://www.johannes-strommer.com/formeln/flaechentraegheitsmoment-widerstandsmoment/
# https://www.maschinenbau-wissen.de/skript3/mechanik/festigkeitslehre/134-knicken-euler

# Knicklinien nach ÖNORM B 4600
kn_lamda = [10,20,30,40,50,60,70,80,90,100,110,120,130,140,150,160,170,180,190,200,210,220,230,240,250]

kn235 = [16.5,15.8,15.3,14.8,14.2,13.5,12.7,11.8,10.7,9.5,8.2,6.9,5.9,5.1,4.4,3.9,3.4,3.1,2.7,2.5,2.2,2,1.9,1.7,1.6]
kn275 = [20.5,19.4,18.8,18.0,17.1,16.0,14.8,13.3,11.7,9.9,8.2,6.9,5.9,5.1,4.4,3.9,3.4,3.1,2.7,2.5,2.2,2,1.9,1.7,1.6]
kn355 = [24.5,23.2,22.3,21.2,20.0,18.5,16.7,14.7,12.2,9.9,8.2,6.9,5.9,5.1,4.4,3.9,3.4,3.1,2.7,2.5,2.2,2,1.9,1.7,1.6]
kn460n = [31.7, 30.4, 29.4, 28.4, 27.3, 25.9, 24.4, 22.7, 20.6, 18.3, 15.7, 13.3, 11.3, 9.8, 8.5, 7.5, 6.5, 6, 5.2, 4.8, 4.2, 3.8, 3.7, 3.3, 3.1]
knalu = [10.0,9.6,9.3,9,8.6,8.2,7.7,7.2,6.5,5.8,5.0,4.2,3.6,3.1,2.7,2.4,2.1,1.9,1.6,1.5,1.3,1.2,1.2,1.0,1.0]
knc12_15_rei = [0.80, 0.77, 0.74, 0.72, 0.69, 0.65, 0.62, 0.57, 0.52, 0.46, 0.40, 0.33, 0.29, 0.25, 0.21, 0.19, 0.16, 0.15, 0.13, 0.12, 0.11, 0.10, 0.09, 0.08, 0.08]
knc16_20_rei = [1.07, 1.02, 0.99, 0.96, 0.92, 0.88, 0.82, 0.77, 0.69, 0.62, 0.53, 0.45, 0.38, 0.33, 0.29, 0.25, 0.22, 0.20, 0.18, 0.16, 0.14, 0.13, 0.12, 0.11, 0.10]
knc20_25_rei = [1.33, 1.27, 1.23, 1.19, 1.14, 1.09, 1.02, 0.95, 0.86, 0.77, 0.66, 0.56, 0.48, 0.41, 0.35, 0.31, 0.27, 0.25, 0.22, 0.20, 0.18, 0.16, 0.15, 0.14, 0.13]
knc25_30_rei = [1.67, 1.60, 1.55, 1.50, 1.44, 1.37, 1.29, 1.19, 1.08, 0.96, 0.83, 0.70, 0.60, 0.52, 0.45, 0.39, 0.34, 0.31, 0.27, 0.25, 0.22, 0.20, 0.19, 0.17, 0.16]
knc30_37_rei = [2.00, 1.92, 1.85, 1.79, 1.72, 1.64, 1.54, 1.43, 1.30, 1.15, 0.99, 0.84, 0.72, 0.62, 0.53, 0.47, 0.41, 0.38, 0.33, 0.30, 0.27, 0.24, 0.23, 0.21, 0.19]
knc35_45_rei = [2.33, 2.23, 2.16, 2.09, 2.01, 1.91, 1.79, 1.67, 1.51, 1.34, 1.16, 0.97, 0.83, 0.72, 0.62, 0.55, 0.48, 0.44, 0.38, 0.35, 0.31, 0.28, 0.27, 0.24, 0.23]
knc40_50_rei = [2.67, 2.56, 2.48, 2.39, 2.30, 2.18, 2.06, 1.91, 1.73, 1.54, 1.33, 1.12, 0.95, 0.83, 0.71, 0.63, 0.55, 0.50, 0.44, 0.40, 0.36, 0.32, 0.31, 0.28, 0.26]
knc45_55_rei = [3.00, 2.87, 2.78, 2.69, 2.58, 2.45, 2.31, 2.15, 1.95, 1.73, 1.49, 1.25, 1.07, 0.93, 0.80, 0.71, 0.62, 0.56, 0.49, 0.45, 0.40, 0.36, 0.35, 0.31, 0.29]
knc50_60_rei = [3.33, 3.19, 3.09, 2.99, 2.87, 2.72, 2.56, 2.38, 2.16, 1.92, 1.65, 1.39, 1.19, 1.03, 0.89, 0.79, 0.69, 0.63, 0.54, 0.50, 0.44, 0.40, 0.38, 0.34, 0.32]
knc55_67_rei = [3.67, 3.51, 3.40, 3.29, 3.16, 3.00, 2.82, 2.62, 2.38, 2.11, 1.82, 1.53, 1.31, 1.13, 0.98, 0.87, 0.76, 0.69, 0.60, 0.56, 0.49, 0.44, 0.42, 0.38, 0.36]
knc60_75_rei = [4.00, 3.83, 3.71, 3.59, 3.44, 3.27, 3.08, 2.86, 2.59, 2.30, 1.99, 1.67, 1.43, 1.24, 1.07, 0.95, 0.82, 0.75, 0.65, 0.61, 0.53, 0.48, 0.46, 0.41, 0.39]
knc70_85_rei = [4.67, 4.47, 4.33, 4.19, 4.02, 3.82, 3.59, 3.34, 3.03, 2.69, 2.32, 1.95, 1.67, 1.44, 1.25, 1.10, 0.96, 0.88, 0.76, 0.71, 0.62, 0.57, 0.54, 0.48, 0.45]
knc80_95_rei = [5.33, 5.10, 4.94, 4.78, 4.59, 4.36, 4.10, 3.81, 3.46, 3.07, 2.65, 2.23, 1.91, 1.65, 1.42, 1.26, 1.10, 1.00, 0.87, 0.81, 0.71, 0.65, 0.61, 0.55, 0.52]
knc90_105_rei = [6.0, 5.75, 5.56, 5.38, 5.16, 4.91, 4.62, 4.29, 3.89, 3.45, 2.98, 2.51, 2.15, 1.85, 1.60, 1.42, 1.24, 1.13, 0.98, 0.91, 0.80, 0.73, 0.69, 0.62, 0.58]
knc100_115_rei = [6.67, 6.39, 6.18, 5.98, 5.74, 5.46, 5.13, 4.77, 4.33, 3.84, 3.31, 2.79, 2.39, 2.06, 1.78, 1.58, 1.37, 1.25, 1.09, 1.01, 0.89, 0.81, 0.77, 0.69, 0.65]
uhpc_unreinf = [1.5, 1.44, 1.39, 1.35, 1.29, 1.23, 1.15, 1.07, 0.97, 0.86, 0.75, 0.63, 0.54, 0.46, 0.40, 0.35, 0.31, 0.28, 0.25, 0.23, 0.20, 0.18, 0.17, 0.15, 0.15]
uhpc_fibre_reinforced = [10, 9.58, 9.27, 8.97, 8.61, 8.18, 7.70, 7.15, 6.48, 5.76, 4.97, 4.18, 3.58, 3.09, 2.67, 2.36, 2.06, 1.88, 1.64, 1.52, 1.33, 1.21, 1.15, 1.03, 0.97]
softwood_c16 = [0.86, 0.82, 0.80, 0.77, 0.74, 0.70, 0.66, 0.62, 0.56, 0.50, 0.43, 0.36, 0.31, 0.27, 0.23, 0.20, 0.18, 0.16, 0.14, 0.13, 0.11, 0.10, 0.10, 0.09, 0.08]
softwood_c24 = [1.30, 1.24, 1.21, 1.17, 1.12, 1.06, 1.00, 0.93, 0.84, 0.75, 0.65, 0.54, 0.46, 0.40, 0.35, 0.31, 0.27, 0.24, 0.21, 0.20, 0.17, 0.16, 0.15, 0.13, 0.13]
softwood_c30 = [1.63, 1.56, 1.51, 1.46, 1.40, 1.33, 1.25, 1.17, 1.06, 0.94, 0.81, 0.68, 0.58, 0.50, 0.43, 0.39, 0.34, 0.31, 0.27, 0.25, 0.22, 0.20, 0.19, 0.17, 0.16]
softwood_c35 = [1.89, 1.81, 1.75, 1.70, 1.63, 1.55, 1.45, 1.35, 1.23, 1.09, 0.94, 0.79, 0.68, 0.58, 0.50, 0.45, 0.39, 0.36, 0.31, 0.29, 0.25, 0.23, 0.22, 0.19, 0.18]
softwood_strength = [4, 3.83, 3.71, 3.59, 3.44, 3.27, 3.08, 2.86, 2.59, 2.30, 1.99, 1.67, 1.43, 1.24, 1.07, 0.95, 0.82, 0.75, 0.65, 0.61, 0.53, 0.48, 0.46, 0.41, 0.39]
hardwood_c30 = [1.63, 1.56, 1.51, 1.46, 1.40, 1.33, 1.25, 1.17, 1.06, 0.94, 0.81, 0.68, 0.58, 0.50, 0.43, 0.39, 0.34, 0.31, 0.27, 0.25, 0.22, 0.20, 0.19, 0.17, 0.16]
hardwood_c35 = [1.89, 1.81, 1.75, 1.70, 1.63, 1.55, 1.45, 1.35, 1.23, 1.09, 0.94, 0.79, 0.68, 0.58, 0.50, 0.45, 0.39, 0.36, 0.31, 0.29, 0.25, 0.23, 0.22, 0.19, 0.18]
hardwood_c40 = [2.17, 2.08, 2.01, 1.95, 1.87, 1.78, 1.67, 1.55, 1.41, 1.25, 1.08, 0.91, 0.78, 0.67, 0.58, 0.51, 0.45, 0.41, 0.36, 0.33, 0.29, 0.26, 0.25, 0.22, 0.21]
hardwood_c60 = [3.25, 3.11, 3.01, 2.92, 2.80, 2.66, 2.50, 2.32, 2.11, 1.87, 1.62, 1.36, 1.16, 1.00, 0.87, 0.77, 0.67, 0.61, 0.53, 0.49, 0.43, 0.39, 0.37, 0.33, 0.32]
hardwood_strength = [6, 5.75, 5.56, 5.38, 5.16, 4.91, 4.62, 4.29, 3.89, 3.45, 2.98, 2.51, 2.15, 1.85, 1.60, 1.42, 1.24, 1.13, 0.98, 0.91, 0.80, 0.73, 0.69, 0.62, 0.58]
glulam_24 = [1.30, 1.24, 1.21, 1.17, 1.12, 1.06, 1.00, 0.93, 0.84, 0.75, 0.65, 0.54, 0.46, 0.40, 0.35, 0.31, 0.27, 0.24, 0.21, 0.20, 0.17, 0.16, 0.15, 0.13, 0.13]
glulam_28 = [1.52, 1.46, 1.41, 1.36, 1.31, 1.24, 1.17, 1.09, 0.99, 0.88, 0.76, 0.64, 0.54, 0.47, 0.41, 0.36, 0.31, 0.29, 0.25, 0.23, 0.20, 0.18, 0.18, 0.16, 0.15]
glulam_30 = [1.63, 1.56, 1.51, 1.46, 1.40, 1.33, 1.25, 1.17, 1.06, 0.94, 0.81, 0.68, 0.58, 0.50, 0.43, 0.39, 0.34, 0.31, 0.27, 0.25, 0.22, 0.20, 0.19, 0.17, 0.16]
glulam_32 = [1.73, 1.66, 1.60, 1.55, 1.49, 1.42, 1.33, 1.24, 1.12, 1.00, 0.86, 0.72, 0.62, 0.53, 0.46, 0.41, 0.36, 0.33, 0.28, 0.26, 0.23, 0.21, 0.20, 0.18, 0.17]
masonry_old = [0.4, 0.38, 0.37, 0.36, 0.34, 0.33, 0.31, 0.29, 0.26, 0.23, 0.20, 0.17, 0.14, 0.12, 0.11, 0.09, 0.08, 0.08, 0.07, 0.06, 0.05, 0.05, 0.05, 0.04, 0.04]
masonry_new = [1.0, 0.96, 0.93, 0.90, 0.86, 0.82, 0.77, 0.72, 0.65, 0.58, 0.50, 0.42, 0.36, 0.31, 0.27, 0.24, 0.21, 0.19, 0.16, 0.15, 0.13, 0.12, 0.12, 0.10, 0.10]
kncustom = [16.5,15.8,15.3,14.8,14.2,13.5,12.7,11.8,10.7,9.5,8.2,6.9,5.9,5.1,4.4,3.9,3.4,3.1,2.7,2.5,2.2,2,1.9,1.7,1.6]

library = [
	# name, name in dropdown, E, G, d, acceptable_sigma, acceptable_shear, acceptable_torsion, acceptable_sigmav, knick_model
	# diese gelten nach ÖNORM B 4600 für den Erhöhungsfall und entsprechen 100 % beim Knicken (lamda<20)
	["steel_S235", "Steel S235", 21000, 8100, 7.85, 16.5, 9.5, 10.5, 23.5, kn235],
	["steel_S275", "Steel S275", 21000, 8100, 7.85, 20.5, 11, 12.5, 27.5, kn275],
	["steel_S355", "Steel S355", 21000, 8100, 7.85, 24.5, 13, 15, 35.5, kn355],
	["steel_S460N", "Steel S460N", 21000, 8100, 7.85, 31.7, 16.8, 19.4, 46, kn460n],
	["alu_Al_CU4Ti", "Alu Al-Cu4Ti", 8000, 3000, 2.70, 10, 7, 10.5, 22.0, knalu],
	["concrete_reinf_C12/15", "Concrete-reinforced C12/15", 2700, 1125, 2.5, 0.80, 0.07, 0.07, 1.2, knc12_15_rei],
	["concrete_reinf_C16/20", "Concrete-reinforced C16/20", 2900, 1208, 2.5, 1.07, 0.09, 0.09, 1.6, knc16_20_rei],
	["concrete_reinf_C20/25", "Concrete-reinforced C20/25", 3000, 1250, 2.5, 1.33, 0.105, 0.105, 2.0, knc20_25_rei],
	["concrete_reinf_C25/30", "Concrete-reinforced C25/30", 3100, 1292, 2.5, 1.67, 0.125, 0.125, 2.5, knc25_30_rei],
	["concrete_reinf_C30/37", "Concrete-reinforced C30/37", 3300, 1375, 2.5, 2.00, 0.140, 0.140, 3.0, knc30_37_rei],
	["concrete_reinf_C35/45", "Concrete-reinforced C35/45", 3400, 1417, 2.5, 2.33, 0.155, 0.150, 3.5, knc35_45_rei],
	["concrete_reinf_C40/50", "Concrete-reinforced C40/50", 3500, 1458, 2.5, 2.67, 0.165, 0.165, 4.0, knc40_50_rei],
	["concrete_reinf_C45/55", "Concrete-reinforced C45/55", 3600, 1500, 2.5, 3.00, 0.175, 0.175, 4.5, knc45_55_rei],
	["concrete_reinf_C50/60", "Concrete-reinforced C50/60", 3700, 1542, 2.5, 3.33, 0.194, 0.194, 5.0, knc50_60_rei],
	["concrete_reinf_C55/67", "Concrete-reinforced C55/67", 3800, 1583, 2.5, 3.67, 0.214, 0.214, 5.5, knc55_67_rei],
	["concrete_reinf_C60/75", "Concrete-reinforced C60/75", 3900, 1625, 2.5, 4.00, 0.233, 0.233, 6.0, knc60_75_rei],
	["concrete_reinf_C70/85", "Concrete-reinforced C70/85", 4100, 1708, 2.5, 4.67, 0.272, 0.272, 7.0, knc70_85_rei],
	["concrete_reinf_C80/95", "Concrete-reinforced C80/95", 4200, 1750, 2.5, 5.33, 0.311, 0.311, 8.0, knc80_95_rei],
	["concrete_reinf_C90/105", "Concrete-reinforced C90/105", 4400, 1833, 2.5, 6.00, 0.35, 0.35, 9.0, knc90_105_rei],
	["concrete_reinf_C100/115", "Concrete-reinforced C100/115", 4500, 1875, 2.5, 6.67, 0.389, 0.389, 10, knc100_115_rei],
	["UHPC_unreinforced", "UHPC-unreinforced", 5000, 2083, 2.4, 1.50, 0.5, 0.5, 1.5, uhpc_unreinf],
	["UHPC_fibre_reinforced", "UHPC-fibre reinforced", 5000, 2083, 2.5, 10, 1.5, 1.5, 10, uhpc_fibre_reinforced],

	["softwood_C16", "Softwood C16", 800, 50, 0.37, 0.86, 0.09, 0.09, 0.86, softwood_c16],
	["softwood_C24", "Softwood C24", 1100, 69, 0.42, 1.3, 0.10, 0.10, 1.30, softwood_c24],
	["softwood_C30", "Softwood C30", 1200, 75, 0.46, 1.63, 0.13, 0.13, 1.63, softwood_c30],
	["softwood_C35", "Softwood C35", 1300, 81, 0.47, 1.89, 0.15, 0.15, 1.89, softwood_c35],
	["softwood-strength", "Softwood strength", 1300, 81, 0.47, 4, 0.27, 0.27, 4, softwood_strength],

	["hardwood_C30", "Hardwood C30", 1100, 69, 0.64, 1.63, 0.13, 0.13, 1.63, hardwood_c30],
	["hardwood_C35", "Hardwood C35", 1200, 75, 0.65, 1.89, 0.15, 0.15, 1.89, hardwood_c35],
	["hardwood_C40", "Hardwood C40", 1300, 81, 0.66, 2.17, 0.17, 0.17, 2.17, hardwood_c40],
	["hardwood_C60", "Hardwood C60", 1700, 106, 0.84, 3.25, 0.33, 0.33, 3.25, hardwood_c60],
	["hardwood-strength", "Hardwood strength", 1700, 106, 0.84, 6, 0.41, 0.41, 6, hardwood_strength],

	["glulam_24", "Glulam GL24", 1150, 65, 0.42, 1.30, 0.10, 0.10, 1.30, glulam_24],
	["glulam_28", "Glulam GL28", 1260, 65, 0.46, 1.52, 0.116, 0.116, 1.52, glulam_28],
	["glulam_30", "Glulam GL30", 1360, 65, 0.48, 1.63, 0.16, 0.16, 1.63, glulam_30],
	["glulam_32", "Glulam GL32", 1420, 65, 0.49, 1.73, 0.17, 0.17, 1.73, glulam_32],

	["masonry_old", "Masonry old brick", 120, 48, 1.6, 0.4, 0.01, 0.01, 0.4, masonry_old],
	["masonry_new", "Masonry new brick", 400, 160, 1.6, 1.0, 0.03, 0.03, 1.0, 1.6, masonry_new],
	["custom", "Custom", 21000, 8100, 7.85, 16.0, 9.5, 10.5, 23.5, kncustom]
	]


dropdown = []
for material in library:
	dropdown_entry = (material[0], material[1], "")
	dropdown.append(dropdown_entry)

# current setting passed from gui
# (because a property can not be set in gui)
current = {}

def update():
	# moment of inertia, 32.9376 cm⁴
	current["Iy"] = pi * (current["Do"]**4 - current["Di"]**4)/64
	current["Iz"] = current["Iy"]

	# torsional constant, 65.875 cm⁴
	current["J"] = pi * (current["Do"]**4 - current["Di"]**4)/(32)

	# cross-sectional area, 8,64 cm²
	current["A"] = ((pi * (current["Do"]*0.5)**2) - (pi * (current["Di"]*0.5)**2))

	# weight of profile, 6.78 kg/m
	current["weight_A"] =  current["A"]*current["rho"] * 0.1

	current["ir"] = sqrt(current["Iy"]/current["A"])

# for quads, wie bei Stäbe
# knconcrete = [16.5,15.8,15.3,14.8,14.2,13.5,12.7,11.8,10.7,9.5,8.2,6.9,5.9,5.1,4.4,3.9,3.4,3.1,2.7,2.5,2.2,2,1.9,1.7,1.6]
# knmasonry = [16.5,15.8,15.3,14.8,14.2,13.5,12.7,11.8,10.7,9.5,8.2,6.9,5.9,5.1,4.4,3.9,3.4,3.1,2.7,2.5,2.2,2,1.9,1.7,1.6]
# kncustom = [16.5,15.8,15.3,14.8,14.2,13.5,12.7,11.8,10.7,9.5,8.2,6.9,5.9,5.1,4.4,3.9,3.4,3.1,2.7,2.5,2.2,2,1.9,1.7,1.6]


library_quads = [
	# name, name in dropdown, E, G, nu, rho, acceptable_sigma, acceptable_shear, acceptable_sigmav, knick_model
	["steel_S235", "Steel S235", 21000, 8100, 0.32, 7.85, 16.5, 9.5, 23.5, kn235],
	["steel_S275", "Steel S275", 21000, 8100, 0.32, 7.85, 20.5, 11, 27.5, kn275],
	["steel_S355", "Steel S355", 21000, 8100, 0.32, 7.85, 24.5, 13, 35.5, kn355],
	["steel_S460N", "Steel S460N", 21000, 8100, 0.32, 7.85, 31.7, 16.8, 46, kn460n],
	["alu_Al_CU4Ti", "Alu Al-Cu4Ti", 8000, 3000, 0.35, 2.70, 10, 7, 10.5, 22.0, knalu],
	["concrete_reinf_C12/15", "Concrete-reinforced C12/15", 2700, 1125, 0.2, 2.5, 0.80, 0.07, 1.2, knc12_15_rei],
	["concrete_reinf_C16/20", "Concrete-reinforced C16/20", 2900, 1208, 0.2, 2.5, 1.07, 0.09, 1.6, knc16_20_rei],
	["concrete_reinf_C20/25", "Concrete-reinforced C20/25", 3000, 1250, 0.2, 2.5, 1.33, 0.105, 2.0, knc20_25_rei],
	["concrete_reinf_C25/30", "Concrete-reinforced C25/30", 3100, 1292, 0.2, 2.5, 1.67, 0.125, 2.5, knc25_30_rei],
	["concrete_reinf_C30/37", "Concrete-reinforced C30/37", 3300, 1375, 0.2, 2.5, 2.00, 0.140, 3.0, knc30_37_rei],
	["concrete_reinf_C35/45", "Concrete-reinforced C35/45", 3400, 1417, 0.2, 2.5, 2.33, 0.155, 3.5, knc35_45_rei],
	["concrete_reinf_C40/50", "Concrete-reinforced C40/50", 3500, 1458, 0.2, 2.5, 2.67, 0.165, 4.0, knc40_50_rei],
	["concrete_reinf_C45/55", "Concrete-reinforced C45/55", 3600, 1500, 0.2, 2.5, 3.00, 0.175, 4.5, knc45_55_rei],
	["concrete_reinf_C50/60", "Concrete-reinforced C50/60", 3700, 1542, 0.2, 2.5, 3.33, 0.194, 5.0, knc50_60_rei],
	["concrete_reinf_C55/67", "Concrete-reinforced C55/67", 3800, 1583, 0.2, 2.5, 3.67, 0.214, 5.5, knc55_67_rei],
	["concrete_reinf_C60/75", "Concrete-reinforced C60/75", 3900, 1625, 0.2, 2.5, 4.00, 0.233, 6.0, knc60_75_rei],
	["concrete_reinf_C70/85", "Concrete-reinforced C70/85", 4100, 1708, 0.2, 2.5, 4.67, 0.272, 7.0, knc70_85_rei],
	["concrete_reinf_C80/95", "Concrete-reinforced C80/95", 4200, 1750, 0.2, 2.5, 5.33, 0.311, 8.0, knc80_95_rei],
	["concrete_reinf_C90/105", "Concrete-reinforced C90/105", 4400, 1833, 0.2, 2.5, 6.00, 0.35, 9.0, knc90_105_rei],
	["concrete_reinf_C100/115", "Concrete-reinforced C100/115", 4500, 1875, 0.2, 2.5, 6.67, 0.389, 10, knc100_115_rei],
	["UHPC_unreinforced", "UHPC-unreinforced", 5000, 2083, 0.2, 2.4, 1.50, 0.5, 1.5, uhpc_unreinf],
	["UHPC_fibre_reinforced", "UHPC-fibre reinforced", 5000, 2083, 0.2, 2.5, 10, 1.5, 10, uhpc_fibre_reinforced],

	["softwood_C16", "Softwood C16", 800, 50, 0.30, 0.37, 0.86, 0.09, 0.86, softwood_c16],
	["softwood_C24", "Softwood C24", 1100, 69, 0.30, 0.42, 1.3, 0.10, 1.30, softwood_c24],
	["softwood_C30", "Softwood C30", 1200, 75, 0.30, 0.46, 1.63, 0.13, 1.63, softwood_c30],
	["softwood_C35", "Softwood C35", 1300, 81, 0.30, 0.47, 1.89, 0.15, 1.89, softwood_c35],
	["softwood-strength", "Softwood strength", 1300, 81, 0.30, 0.47, 4, 0.27, 4, softwood_strength],

	["hardwood_C30", "Hardwood C30", 1100, 69, 0.30, 0.64, 1.63, 0.13, 1.63, hardwood_c30],
	["hardwood_C35", "Hardwood C35", 1200, 75, 0.30, 0.65, 1.89, 0.15, 1.89, hardwood_c35],
	["hardwood_C40", "Hardwood C40", 1300, 81, 0.30, 0.66, 2.17, 0.17, 2.17, hardwood_c40],
	["hardwood_C60", "Hardwood C60", 1700, 106, 0.30, 0.84, 3.25, 0.33, 3.25, hardwood_c60],
	["hardwood-strength", "Hardwood strength", 1700, 106, 0.30, 0.84, 6, 0.41, 6, hardwood_strength],

	["glulam_24", "Glulam GL24", 1150, 65, 0.30, 0.42, 1.30, 0.10, 1.30, glulam_24],
	["glulam_28", "Glulam GL28", 1260, 65, 0.30, 0.46, 1.52, 0.116, 1.52, glulam_28],
	["glulam_30", "Glulam GL30", 1360, 65, 0.30, 0.48, 1.63, 0.16, 1.63, glulam_30],
	["glulam_32", "Glulam GL32", 1420, 65, 0.30, 0.49, 1.73, 0.17, 1.73, glulam_32],

	["masonry_old", "Masonry old brick", 120, 48, 0.20, 1.6, 0.4, 0.01, 0.4, masonry_old],
	["masonry_new", "Masonry new brick", 400, 160, 0.20, 1.6, 1.0, 0.03, 1.0, masonry_new],
	["custom", "Custom", 21000, 8100, 0.30, 7.85, 16.0, 9.5, 16.0, kncustom]
	]


dropdown_quads = []
for material in library_quads:
	dropdown_entry = (material[0], material[1], "")
	dropdown_quads.append(dropdown_entry)

# current setting passed from gui
# (because a property can not be set in gui)
current_quads = {}