X線による複合材料の熱応力測定

概要

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Thermal stress behavior of W/Cu composites was studied by the X-ray stress measurement method. With the X-ray technique, the thermal stress of the composites due to the thermal expansion coefficient mismatch of component materials has been measured in the form of residual stress at room temperature. This paper reports the thermal stress behavior during heating and cooling of the composites, which was measured by using a new apparatus consisting of an X-ray diffractometer and a vacuum furnace. Generally, the thermal stress behavior of composites is given by the following equation. σ_m=KΔαΔT where σ_m is stress in matrix, K is a constant derived from elastic constants and volume fraction of constituents, Δα is a difference in thermal expansion between the fiber and the matrix and ΔT is a temperature difference. That is, σ_m is a linear function of temperature. During this study, it has been found that the thermal stress behavior of W/Cu composites during heating and cooling does not show a linear relation with respect to temperature, but a hysteresis loop. The loop can be related to the matrix stress-strain behavior at high temperatures.
社団法人日本材料学会の論文
1975-01-15