# proportional limit

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Related to proportional limit: rupture strength, modulus of resilience, ultimate stress

## pro·por·tion·al lim·'it

the greatest stress that a material is capable of sustaining without any deviation from proportionality of stress to strain (Hooke law).
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At the proportional limit state, SDR of the two-layer reinforced cushion was similar to that of the one-layer reinforced cushion, while at the stable state, there was a big difference between them.
This is due to the fact that the proportional limit and the Yield point are not coincident and the Yield point is taken at 0.2% offset.
Nevertheless, in the mechanical testing (Table 4), the FOS + inulin group proportional limit was higher (p<0.05) than control group and it was equal (p<0.05) to the FOS and inulin groups; FOS and inulin groups were also equal (p<0.05) than control group.
The difference lies in the attempt to use equations developed for materials that have a proportional limit on materials that do not have a true proportional limit and not considering the properties of copper strain hardening.
Therefore, there is a concern that bending properties, including Young's modulus, proportional limit stress, and bending strength, cannot be evaluated appropriately by the conventional bending tests.
To simplify the calculations, it was taken, that cyclic proportional limit [[bar.s]sub.T] is independent on [[bar.e].sub.con] [1], the number of semicycles k and on stress ratio [r.sub.[sigma]].
* Proportional limit. The point where the curve starts to deviate from a straight line.
Figure 1 shows the initial portion of a tensile stress-strain curve that identifies the proportional limit. This is the last point on the stress-strain curve where the stress and strain are in proportion.
No difference in modulus of elasticity and modulus of rupture, work to proportional limit, work to maximum load, or fiber stress at proportional limit between samples steamed following treatment and those only treated was shown.
For many materials this proportional limit takes place even below 0.5% strain.
The research conducted herein focused on nondestructive identification of damage in wood that has occurred via bending load in excess of the proportional limit, yet below breaking strength.

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