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GATE Previous Year Questions with solutions: Stress in Each Part Video Lecture | Topper Handwritten Notes & Videos for GATE ME - Mechanical Engineering

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FAQs on GATE Previous Year Questions with solutions: Stress in Each Part Video Lecture - Topper Handwritten Notes & Videos for GATE ME - Mechanical Engineering

1. What is stress and how is it measured in materials?
Ans. Stress is a measure of the internal forces experienced by a material when subjected to external loads. It is typically measured in units of force per unit area, such as pounds per square inch (psi) or pascals (Pa). Stress can be calculated by dividing the applied force by the cross-sectional area of the material.
2. What are the different types of stress that materials can experience?
Ans. Materials can experience several types of stress, including: - Tensile stress: This occurs when a material is subjected to forces that try to pull it apart, causing elongation in the direction of the applied force. - Compressive stress: This happens when a material is subjected to forces that try to push it together, causing compression in the direction of the applied force. - Shear stress: This type of stress occurs when forces act parallel to each other but in opposite directions, causing the material to deform by sliding. - Bending stress: This occurs in beams or other structures that are subjected to forces that cause them to bend.
3. How does stress affect the behavior and properties of materials?
Ans. Stress can significantly impact the behavior and properties of materials. Excessive stress can cause deformation, plasticity, or failure in a material. It can affect the material's strength, stiffness, and durability. Different materials have different stress-strain relationships, which determine how they respond to applied stress.
4. What is the difference between stress and strain?
Ans. Stress and strain are related but distinct concepts in materials science. - Stress refers to the internal forces experienced by a material when subjected to external loads. It is a measure of the intensity of the applied force per unit area. - Strain, on the other hand, refers to the measure of the deformation or change in shape that occurs in a material when subjected to stress. It is a dimensionless quantity that represents the relative change in length or volume of a material.
5. How can stress be reduced or managed in materials?
Ans. Stress in materials can be reduced or managed through various techniques, depending on the specific application and material involved. Some common methods include: - Reinforcement: Adding reinforcing materials or structures to distribute stresses more evenly and reduce concentrations in a particular region. - Reducing applied loads: Decreasing the magnitude or altering the direction of the applied forces to minimize stress levels. - Material selection: Choosing materials with higher strength or better stress-resistance properties for a given application. - Reducing temperature: Lowering the temperature can reduce thermal stress in materials. - Design optimization: Optimizing the shape, dimensions, and structural layout of a component or system to minimize stress concentrations.
59 videos|189 docs
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