The greatest stress which may be produced in a material such that stress is directly proportional to the strain is known as:
Proportional limit—Magnitude of elastic stress above which plastic deformation occurs.
The greatest stress which may be produced in a material such that stress is directly proportional to the strain is known as the proportional limit.
Reference: PHILLIPS’ SCIENCE OF DENTAL MATERIALS, 12th ed page no 48
The elastic limit
The proportional limit
The yield strength
Modulus of elasticity