# ANELASTICITY

Deviation from a proportional relationship between stress and strain.

## Related Terms

### FORM FACTOR

1. The ratio of the effective value of a periodic function, such as an alternating current, to its average absolute value.
2. A factor that takes the shape of a coil into account when computing its inductance. Also known as the shape factor.
3. The theoretical stress concentration factor for a given shape, for a perfectly elastic material.

### PLATE MODULUS

The ratio of the stress component Txx in an isotropic, elastic body obeying a generalized Hooke's law to the corresponding strain component Sxx, when the strain components Syy and Szz are 0; the sum of the Poisson ratio and twice the rigidity modulus.

### PLASTICOVISCOSITY

Plasticity in which the rate of deformation of a body subjected to stresses greater than the yield stress is a linear function of the stress.

### PLASTIC DEFORMATION

Permanent change in shape or size of a solid body without fracture resulting from the application of sustained stress beyond the elastic limit.

### PLANE STRESS

A state of stress in which two of the principal stresses are always parallel to a given plane and are constant in the normal direction.

### OPERATING STRESS

The stress to which a structural unit is subjected in service.

### OFFSET YIELD STRENGTH

That stress at which the strain surpasses by a specific amount (called the offset) an extension of the initial proportional portion of the stress-strain curve; usually expressed in pounds per square inch.

### NORMAL STRESS

The stress component at a point in a structure which is perpendicular to the reference plane.

### NEUTRAL FIBER

A line of zero stress in cross section of a bent beam, separating the region of compressive stress from that of tensile stress.

### NEUTRAL AXIS

In a beam bent downward, the line of zero stress below which all fibers are in tension and above which they are in compression.

### Related questions

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