The main factors include material properties, load conditions, environmental influences, geometry of the structure, and boundary conditions. Understanding the interplay between these factors helps in predicting how a structure will respond under different scenarios.

Stress refers to the internal forces in a material divided by its cross-sectional area, often measured in Pascals. Strain, on the other hand, is the deformation or displacement of a material measured by the change in length divided by the original length. Stress is a cause, while strain is an effect.

In one project, we faced unexpected load conditions that required redesigning a critical component under a tight deadline. I conducted a thorough analysis using finite element methods to reassess the design parameters and collaborated with the materials team to select a more suitable alloy, ensuring the project stayed on track.

I often use ANSYS and SolidWorks for finite element analysis due to their robust simulation capabilities and user-friendly interfaces. They provide precise modeling and ease in validating analysis with experimental results, which is crucial for accurate stress analysis.

I ensure accuracy by double-checking input data, conducting mesh sensitivity analysis, comparing simulation results to experimental data, and performing validation checks with known analytical solutions. Peer reviews and adhering to industry standards also contribute to maintaining accuracy.

Material selection is essential because different materials respond differently to stress. The right choice dictates the structure's durability, weight, and overall performance. For example, selecting a material with high tensile strength and corrosion resistance is crucial for applications in high-stress environments.