Creep and Cyclic Tension Behavior of a Type 316 Stainless Steel at Room Temperature

Abstract

The behavior of a Type 316 L austenitic stainless steel subject to creep and cyclic tension under imposed load is examined at room temperature. Tests are carried out on the material in both the annealed and work-hardened state; in the latter case the influence of an initial hardening by cyclic tension on the subsequent creep behavior, together with the influence of creep hardening on the subsequent cyclic tension behavior, are determined. All tests are conducted with stresses from half the 0.2 percent yield stress up to a stress leading to an initial plastic strain of about 10 percent. We demonstrate the existence of a (critical) stress limit for creep and a stress limit for (cyclic) accommodation. The creep strain, for a given time interval, increases with the applied stress and, in general, the material continues to creep after 10 000 h. The plastic elongation, between the 1st and the 1000th cycle, that occurs during cyclic tension tests on the annealed materials goes through a maximum when plotted as a function of the maximum applied stress. The creep strain obtained after prior cyclic tension (1000 cycles at the same maximum stress level) has the same stress dependence as the plastic strain that occurs between the 1st and the 1000th cycle, and exhibits a maximum. A creep pre-strain before the cyclic tension tests considerably decreases the elongation measured during cycling.

An Investigation on the Polymer Composite Medical Device - External Fixator

“…The most commonly used materials in current clinical practice for Ilizarov external fixators are stainless steel and aluminium. Standard values for the mechanical properties of stainless steel (E ¼ 210 GPa, ¼ 0.31) [25] were used for the ring material in the FEM model.…”