Exam Question

### (a) Describe in detail how brittle fracture is instrumental in causing failure of materials.
Brittle fracture is a critical failure mechanism characterized by rapid, unstable crack propagation with little or no macroscopic plastic deformation before fracture. It is particularly dangerous because it often occurs without significant warning, leading to catastrophic failure. Unlike ductile fracture, which involves substantial energy absorption through plastic deformation (necking), brittle fracture absorbs very little energy.
**Mechanism of Brittle Fracture:**
* **Initiation:** Brittle fracture typically initiates at pre-existing flaws or stress concentrators within the material. These can include: