2次元検出器を利用した粗大粒の内部応力評価

Stress evaluation in material with coarse grains using area detector

鈴木 賢治*; 菖蒲 敬久  ; 城 鮎美; Zhang, S.*

Suzuki, Kenji*; Shobu, Takahisa; Shiro, Ayumi; Zhang, S.*

回折斑点追跡法とスパイラルスリットを組みあわせ、粗大粒を有する材料内部応力評価測定法を開発した。曲げたマグネシウム合金に対して本測定法を適用し、内部応力計測が可能であることを確認した。また溶接したマグネシウム合金に対して内部応力評価を実施し、粗大粒を有する溶接部に対しても有限要素解析とほぼ同様の結果を得ることに成功した。

The spiral slit-system and DSTM (diffraction spot trace method) are under development in order to evaluate internal stresses of materials with coarse grains. The bending stress in the specimen with coarse grains was measured in order to confirm performance of this advanced spiral slit-system. It was proved that the combination of the advanced spiral slit-system and the DSTM is useful for the internal stress measurement of materials with coarse grains. The welded specimen of a Mg-alloy plate was prepared by melt-run with TIG welding. The residual stress map in the cross-section of the specimen was made using the DSTM. On the other hand, the residual stresses of the welded specimen were simulated by a finite element method. The measured residual stresses were similar to the simulated results, and the residual stresses due to extrusion were measured also using the DSTM. Therefore, the DSTM is suitable for the stress measurement of weld parts.