Effect of tensile offset angles on micro/nanoscale tensile testing

Journal Article · Tue Mar 01 04:00:00 EST 2005 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.1865732· OSTI ID:20644130

Xiaodong, Li; Xinnan, Wang; Weiche, Chang; Chao, Yuh J; Ming, Chang ^[1]

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1. Department of Mechanical Engineering, University of South Carolina, 300 Main Street, Columbia, South Carolina 29208 (United States)

For one-dimensional (1D) structures such as tubes, wires, and beams, tensile testing is a simple and reliable methodology for measuring their mechanical properties. The tensile offset angle effect on mechanical property measurement has long been ignored. In this study, theoretical and finite-element analysis (FEA) models for analyzing the tensile offset angle effect have been established. It is found that longitudinal stress decreases with increasing offset angles. The theoretically calculated elastic modulus relative errors reach 4.45% at the offset angle of 10 deg., whereas the experimentally measured elastic modulus relative errors are 45.4% at the offset angle of 15 deg. The difference in elastic modulus relative errors between the theoretical analysis and the experimental results is discussed with reference to the sensing system in the experimental instrumentation. To accurately measure the mechanical properties using the tensile testing technique, perfect alignment with a zero or small offset angle less than 5 deg. is needed. A calibration methodology for aligning specimens has been developed.

• OSTI ID: 20644130
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 3 Vol. 76; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALIGNMENT
CALIBRATION
ERRORS
FINITE ELEMENT METHOD
MATERIALS TESTING
MECHANICAL PROPERTIES
NANOTUBES
POLYMERS
STRESSES