MEASUREMENT OF TENSILE PROPERTIES OF WELDED DISSIMILAR MATERIAL AT HIGH STRAIN RATE USING SPLIT HOPKINSON PRESSURE BAR ARRANGEMENT | ||||
| JES. Journal of Engineering Sciences | ||||
| Article 5, Volume 45, No 1, January and February 2017, Page 60-69 PDF (957.92 K) | ||||
| Document Type: Research Paper | ||||
| DOI: 10.21608/jesaun.2017.116087 | ||||
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| Authors | ||||
| H . M. Abdrahman; W . M. Khairaldien; A . A. Khalil | ||||
| Department of Mechanical Eng., Faculty of Engineering, Assiut University, Assiut, Egypt | ||||
| Abstract | ||||
| Modern industrial and constructional applications require clear understanding of engineering material behavior under dynamic loading conditions especially for junction with dissimilar material. The most accurate method available for studying dynamic behavior accurately Split Hopkinson, however the compression nature of the test hinder the usage of this technique of split Hopkinson pressure bars which was designed to characterize compressive load material behavior. Many trial were made to modify SHPB gain the capability of loading samples in uniaxial tension using different construction modifications. However most of these trails failed to provide the adequate condition of wave motions and neglected the losses due to geometrical arrangement. In this work a simple method was proposed and executed to produce a tensile wave in the Hopkinson bar and use it to measure the tensile properties of material. The uniaxial tension load was applied with the help of a double cone opposites to each other that transfer the compression wave into a tensile wave through two cone ends that hit a hollow cylinder with machine cone ends holes the widen when the bars hit it with a compression wave and transfer the compression wave into a tension wave. The specimen used was a bimetal welded specimen which was tested under loading rates up to 500 s-1. The results showed a similarity in performance compared to static test but at a much higher load and at very low plastic deformation. The microstructure examination of the broken specimen shows a small ductile fracture surface and in some loading rates a cup and cone formation tendency | ||||
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