Draw a graph to show the typical stress–strain curve for wood. On the graph,show the modulus of elasticity. State three different factors that affect thisrelationship.

What will be the moment of resistance of the composite section shown in the figure below if the permissible stress in wood and steel is 70 N/mm² and 120 N/mm² respectively. Steel plate Wood -200 4150 400 10

For the composite areas shown below, calculate the moment of inertia about axis X-X and Y-Y. Note that the X-X axis is the centroid. Y 10" X 2" 6" 2" 6"

I. Problem Solving: Answer what is being required. Show you complete solution. 1. Compression test was applied to a certain type of wood. Compute the stress based on the following dimensions. The grains are parallel with the length. а. Dimension (mm) Load (N) Compressive stress (MPa) Compression Test L= 50 Parallel to the grain В 3 75 130,000 W = 75 L = 50 Perpendicular to the Grain В - 75 W = 75 35,000 b. What would be the shear stress for a single shear for the same data in a.? c. What is the modulus of rupture if the width of the specimen is 50mm, depth is 50mm and the effective length is 30cm. The specimen failed at 24KN 2. A moisture test was conducted and the following weights were acquired before and after the wood was placed inside the oven for 24 hours. Initial weight 40g Final Weight 37g Moisture content

A composite sample of carbon reinforced epoxy has dimensions of in 20 in x 20 in x 0.135 in and mass of 3 lb. The carbon fibres have a modulus of elasticity of 80(106) lb/in2 and a density of 0.15 lb/in3. The epoxy matrix has modulus of elasticity of 0.90(106) lb/in2 and a density of 0.05 lb/in3.  Assume there are no voids in the sample, calculate the volume fraction of: (i) The carbon fibres (ii) The epoxy matrix in the sample.

please answer these two question 1.Explain the reason that flexural modulus of elasticity and compression test modulus of elasticity must be considered separately when both the flexural test and the parallel to grain compressive test caused normal stresses parallel to the grain of the wood. 2. Discuss the difference between isotropic and orthotropic materials for wood.

4. According to ASTM A615, what are the minimum yield stress, tensile stress, and elongation for a No. 6 Grade 100 bar?