Evaluation of Elastic Moduli — Lesson 2

This lesson covers the micro mechanics of Lamina, focusing on the determination of engineering constants such as longitudinal Young's modulus, transverse Young's modulus, portions ratio, and Shear modulus using the mechanics of material approach. The lesson also discusses the importance of studying micro mechanics of Lamina, different terminologies used, and various approaches. It further explains how the addition of fibers in a matrix can significantly increase the stiffness of the composite. The lesson concludes by highlighting the limitations of the mechanics of material approach in predicting the transverse modulus and shear modulus.

Video Highlights

01:01 - Various approaches in micro mechanics of Lamina
05:01 - Explanation of how addition of fibers in a matrix increases stiffness
12:57 - Explanation of the determination of in-plane Shear modulus of a lamina
29:27 - Discussion on the influence of fiber properties and volume fraction on the longitudinal Young's modulus
33:35 - Explanation of the determination of composite stress strain curve using the Matrix and the fiber
41:58 - Discussion on the influence of fiber properties and volume fraction on the transverse Young's modulus

Key Takeaways

- The micro mechanics of Lamina is crucial in understanding the behavior of composite materials.
- The mechanics of material approach can be used to determine engineering constants such as longitudinal Young's modulus, transverse Young's modulus, portions ratio, and Shear modulus.
- The addition of fibers in a matrix significantly increases the stiffness of the composite.
- The mechanics of material approach has limitations in predicting the transverse modulus and shear modulus.