An area detector technique has to be applied to the strain scanning method for materials with coarse grains. A new rotating slit system was designed for a 2-dimensional (2D) detector strain scanning method. The rotating slit system can focus the 2D detector on the center of the goniometer, and the gauge volume is made by the rotating slit system. The stress measurements were examined with the rotating slit and 2D detector. The measured diffraction spots shifted for the 2D strain scanning. The magnitu...
英字タイトル:
Evaluation of Internal Stresses using Area Detectors

An area detector technique has to be applied to the strain scanning method for the coarse grains. A new rotating slit system was designed for a 2-dimensional (2D) detector strain scanning method. The rotating slit system focuses the 2D detector on the center of the goniometer, an d the gauge volume is made by the rotating slit system. The stress measurements were examined by the rotating slit and 2D detector. The measured diffraction spots shifted for the 2D strain scanning. The magnitude of the shift of t...
英字タイトル:
Study on Evaluation of Internal Stresses using Area Detector

The material of the specimen was austenitic stainless steel, SUS316L. The residual stresses in the specimen was introduced by a water j et peening (WJP). The change in the residual stress with thermal aging at 773K was measured by an X-ray stress measurement. The WJP res idual stresses were an equi-biaxial stress state, and the compressive residual stress did not decrease against the thermal aging. To i nvestigate dependence of the residual stress on a lattice plane, the WJP residual stresses were measured...
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Characteristics of Residual Stresses of Water Jet Peened Stainless Steel

A diffraction spot trace method (DSTM) was developed to measure internal stresses of materials with coarse grains. The DSTM was applied to light metals, such as aluminum alloy and magnesium alloy. In this study, validity of the DSTM was examined using high energy synchrotron X-rays of 70 keV. The specimen was a welded plate of austenitic stainless steel (SUS316L). The thickness of the specimen was 9 mm. The improved rotating slit-system was used, and PILATUS was used as an area detector. It was diffi...
英字タイトル:
Evaluation of Welding Residual Stresses in Austenitic Stainless Steel Using Diffraction Spot Trace Method

A diffraction spot trace method (DSTM) was developed to measure internal stresses of materials with coarse grains. The DSTM was applied to light metals, such as aluminum alloy and magnesium alloy. In this study, validity of the DSTM was examined using high energy synchrotron X-rays of 70 keV. The specimen was a welded plate of austenitic stainless steel (SUS316L). The thickness of the specimen was 9 mm. The improved rotating slit-system was used, and PILATUS was used as an area detector. It was difficu...
英字タイトル:
Evaluation of Welding Residual Stresses in Austenitic Stainless Steel Using Diffraction Spot Trace Method

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 spiral slit-system was improved so that the length of the gauge volume is independent of the diffraction angle. The bending stress in the specimen with coarse grains was measured in order to confirm performance of this advanced spiral slit-system. The distribution of the measured bending stress coincided with the applied bending stress. As a r...
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Evaluation of Residual Stresses inWelded Part using Hard Synchrotron X-Rays

大型放射光施設 SPring-8では、現在 57本のビームラインが稼働しているが、そのビームラインの多くが単色 X線を利用している。しかし、本来の放射光は様々な波長を含んでおり、分光器を介さないこれらの光は白色 X線と呼ばれている。白色 X線を利用した応力測定は、古くは 1970年代から登場［1］しており、当時は比較的低エネルギの白色 X線が利用されてきた。 1990年代に入り、SPring-8に代表される第 3世代の大型放射光施設の台頭によって次第に高エネルギ白色 X線の利用が容易となり、主に欧米を中心に研究が進められてきた。 白色 X線を利用した応力測定は、半導体検出器（Solid State Detector: SSD）を利用したエネルギ分散法が一般的である。しかし、ここ数年、白色 X線による応力測定は検出器の開発とともに大きな変革期を迎えている。 本稿では従来のエネルギ分散法による応力測定法の紹介の他に、新たな検出器による白色 X線を利用した応力測定法について述べる。...