Problem $3-$ Material properties at elevated temperature

Plot the following parameters, as per Eurocode $5$ constitutive relations for a typical wood

specimen as a function of temperature:

$($a$)$ Stress$-$strain relationships at $20C,100C,150C,200C,250C$ and $300C($plot on a single

graph$).$

$($b$)$ Thermal capacity as a function of temperature up to $300C.$ Discuss the trend of the results.

$($c$)$ Strength versus temperature relationships from at least two sources. Comment on the

variations in trend.