Final answer:
When a plastic block is under axial compression, a compressive force is evenly applied to its surfaces, resulting in stress distribution and volume deformation. The block's material properties, such as compressive strength and Young's modulus, affect its structural response. The uniform load distribution provided by the caps ensures stability and structural integrity.
Step-by-step explanation:
When a plastic block is under axial compression, a compressive force is applied evenly to the block's surfaces. This results in stress, which is the force per unit area, being distributed evenly throughout the block. The deformation produced is a change in volume, which is similar to other forms of deformation such as tension and shear. The relationship between the change in volume, the force applied, and the area of the block is given by the equation 1 F AV = -Vo, BA, where F is the force, A is the area, V is the change in volume, and Vo is the original volume of the block.The overall structural response of the plastic block under axial compression depends on its material properties, such as its compressive strength and Young's modulus. The compressive strength is the maximum stress that the plastic block can withstand before it fails, while Young's modulus is a measure of the stiffness of the material. If the compressive stress exceeds the compressive strength of the block, it may lead to deformation or failure.The load being evenly distributed throughout the block by the caps positioned at the top and bottom helps in maintaining the stability and structural integrity of the block. This uniform load distribution ensures that the stress is evenly distributed across the block, reducing the likelihood of localized stress concentration. It also helps in preventing any bending or buckling of the block, which could lead to instability or failure.