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Design of a Micro Tensile Testing Structure to Restrain Non-Axial Alignment Errors

[+] Author Affiliations
Duanqin Zhang, Jinkui Chu, Hongyuan Shen

Dalian University of Technology, Dalian, China

Paper No. MNC2007-21184, pp. 635-638; 4 pages
doi:10.1115/MNC2007-21184
From:
  • 2007 First International Conference on Integration and Commercialization of Micro and Nanosystems
  • First International Conference on Integration and Commercialization of Micro and Nanosystems, Parts A and B
  • Sanya, Hainan, China, January 10–13, 2007
  • Conference Sponsors: Nanotechnology Institute
  • ISBN: 0-7918-4265-7 | eISBN: 0-7918-3794-7
  • Copyright © 2007 by ASME

abstract

Accurate mechanical properties measurements in the micro scale are very important for the design and the fail-safe analysis of MEMS. And the tensile test, as one of the micromechanical experimental techniques, has the advantage of uniform stress and strain fields. In this paper, a new tensile testing structure is presented to solve the non-axial alignment problem in microscale tensile test. The testing structure integrates the specimen and the suspended spring beams on a chip. The function of the additional spring beams is to balance the non-axial loading component and so the specimen is uniaxial tensile. As the spring constant of the tensile specimen in the axial direction is much smaller than the spring constant of the testing structure in the vertical direction, the spring beams could specimen caused by non-axial force. Meanwhile, the spring constant of the specimen in axial direction is much larger than that of the spring beams in the same direction so that the loading shared in the spring beams can be ignored. The performance of the tensile testing structure is confirmed by FE simulations. When the loading force has 2° angle with the axial direction, the stress distribution of the specimen is almost identical with that of under axial loading. The axial stress of the specimen is considerably uniform. That is to say the specimen is uniaxially tensile, although the loading direction is offset the axial. And the force shared in the suspended spring beams is below 3.2% of the loading force. The tensile testing structure could greatly weaken the errors caused by disalignment, and would have big potential to be used in the microscale tensile test.

Copyright © 2007 by ASME

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