Advanced Materials & Processes

NOV-DEC 2013

Covers developments in engineering materials selection, processing, fabrication, testing/characterization, materials engineering trends, and emerging technologies, industrial and consumer applications, as well as business and management trends

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Materials Characterization Primer Tensile testing is used to quantitatively measure the strength and ductility of materials, to provide engineering design data, and to determine the mechanical properties of materials subjected to axial loading and deformation. It is also used as a tool for quality assurance of supplied engineering materials. Applications include alloy research and development, determination of the conformance of materials to customer specifications, failure analysis, and the design of engineered components of construction, or machine assemblies subjected to load and deformation. Samples Form: Solids (metals, polymers, ceramics, composites, elastomers). Size/shape: Round or rectangular cross sections with lengths up to approximately 24 in. (~ 60 cm); actual components may be tested full size. Preparation: Specimens are machined in conformance with requirements of standard test procedures, or actual parts or components are used (e.g., threaded fasteners) per standard test procedures. Estimated Analysis Time • Sample-preparation time of up to one hour if extensive cutting/ machining is required. • Approximately five minutes per test to measure sample gage length and cross-sectional area. • Up to approximately 10 minutes testing time per test in the tensile testing machine, which varies depending on the loading rate. • Up to approximately five minutes to perform test measurements and analyze data after testing. TENSILE TESTING William Mankins Metallurgical Services Inc. Related techniques Use of the universal testing machine to perform compression, bending, and shear tests. Extensive tensile test databases allow comparisons with other mechanical tests (e.g., hardness), other alloys, and materials in other heat treated conditions. Limitations The range of testing capabilities is limited by the load capacity of the specific universal testing machine. Testing is destructive to the material tested. ADVANCED MATERIALS & PROCESSES • NOVEMBER-DECEMBER 2013 31

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