Which mechanical property describes an object that is under load and follows Hooke's Law?
- Ductility
- Elasticity
- Malleability
- Plasticity
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Which mechanical property describes an object that is under load and follows Hooke's Law?
→ Hooke’s law states that for relatively small deformations of an object, the displacement or size of the deformation is directly proportional to the deforming force or load.
→ Hooke’s law is a fundamental principle in understanding the behaviour of elastic materials.
The steel used in the chassis members was tested.
The load–extension graph represents the data collected during the testing of a specimen of the steel.
Before testing, the specimen was 1020 mm long with a cross-sectional area of 100 mm².
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i. Young’s modulus
ii. → Elastic deformation is produced by the 20 kN load.
→ After initial stretching the specimen returns to its original length.
→ Plastic deformation is produced by the 30 kN load.
→ The specimen stays deformed subsequent to release.
i. Young’s modulus
ii. → Elastic deformation is produced by the 20 kN load.
→ After initial stretching the specimen returns to its original length.
→ Plastic deformation is produced by the 30 kN load.
→ The specimen stays deformed subsequent to release.
The reinforced concrete modules shown are designed for public seating. A typical use would be as a bus shelter.
A 12 mm diameter steel reinforcing bar was used in this seating module. During a proof test, a load of 26 kN extended a 0.9 m length of this reinforcing bar by 1 mm.
Calculate the value of Young's Modulus (E) for this bar. (3 marks)
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