twin beam overhead crane with single hock

The reason of cracking happened in several coupler beams of 7020 aluminum alloy used in high speed trains has been analyzed by means of optical emission spectrometer,universal material testing machine,optical microscope,scanning electron microscope(SEM) and finite element analysis.

用直读光谱仪、万能材料试验机、光学显微镜、扫描电子显微镜等分析手段,分析高速列车7020铝合金车钩梁多处开裂现象及其原因。