K. n-l ad Homework 3 Due: 9-27-2017 at the start of class related to the topics
ID: 3590473 • Letter: K
Question
K. n-l ad Homework 3 Due: 9-27-2017 at the start of class related to the topics in will be a brief, open notes quiz at the start of elass s video. you need to know what engineering understand this video: ng stress and engineering strain are strain Stress, a: s. Stress is the section in Newtons (or lbe) a or PSI. nd Ao is t nstantaneous load (F) applied perpendicular t in load is the original cross sectional area. Stress is often mea n, : Strain i length (lo). Strain is unitless, but meters per m is the instantaneous change in the length (a) of a male original 1 s change in the length (al) of a material reference meter is often used. From the video: h What are allowable stresses? When discussing mechanical properties, is material failure? Define the following for a stress strain curve atch?v-0gGrbZPeQew, answer the following questions Linear Elastic Region: .Yield point: Yield Stress: Plastic Region: Ultimate Tensile Strength Strain Hardening region Fracture Strength . Necking Region Modulus of Elasticity Strain Energy Modulus of Resilience . . . Modulus of Toughness Define Hooke's Law C, A2Explanation / Answer
Define hooke's law
The law statating that the stress on a solid substance is directly proportional to the strain produced, provided
the stress is less than the elastic limit of the substance
What are the allowable stress
The allowable stres or allowable strength is the maximum stres that is allowed to applyed on a structural
Material the allowable stress are generally defined by building codes and for steel and aluminium is a fraction of their
Yeild stress
1. Fracture
-ductile fracture
-brittile fracture
2 . fatigue
-fatigue failure
-fatigue crack growth rate
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