SEDL / STP / STP608-EB / STP27859S

Stress Relaxation in Bending

Parikh, P
Engineering specialist and supervisor, Mechanical Metallurgy Group, Olin Metals Research Laboratory, New Haven, Conn.

Shapiro, E
Engineering specialist and supervisor, Mechanical Metallurgy Group, Olin Metals Research Laboratory, New Haven, Conn.

Pages: 12    Published: Jan 1976

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Abstract

This paper describes a technique for stress relaxation measurement in bending at ambient and elevated temperatures. This technique utilizes a double-triangle-shaped specimen which is loaded at three points. The load remaining in the specimen at any time during the test is determined using a lift-off technique. This technique satisfies ASTM Recommended Practice for Stress-Relaxation Tests for Materials and Structures (E 328-75). The use of an analytical expression for extrapolation of short-time data to predict behavior at long times is also presented. Data of two copper alloys, phosphor bronze and nickel silver, are extrapolated to estimate the stress relaxation at 100 000 h.