BUCKLING ANALYSIS OF SERIAL CHAIN COMPOSED OF
THE RIGHT-ANGLE-NOTCH FLEXURE HINGES

ZONG Guanghua YU Zhiwei BI Shusheng YU Jingjun SUN Minglei

(School of Mechanical Engineering and Automation, Beihang University, Beijing 100083)

Abstract: The mathematical model, which can be used to calculate the critical force of compliant serial mechanism composed of right-angle-notch flexure hinges, is established by employing the approximative differential equation of the flexible curve of the material bending theory. The buckling critical coefficient of flexibility is defined, and the method is put forward, by which the value of the coefficient could be calculated. The finite element buckling analysis using commercial software ANSYS8.0 is carried out, and the result confirms the correct-ness of the mathematical model established above. The experimental equipment is developed to test buckling critical force of compliant serial mechanism. In order to reduce the influence of load dimension on buckling, the conception of load equivalent length is proposed. Experiments indicate that the experimental value is consistent with the theoretical one. Consequently, the mathematical model proposed above has high reference value, and it can be used as the directive theory for buckling optimization design of compliant serial mechanism.

Key words: Buckling critical force Flexure hinges Reliability Finite element analysis

CLC No: TH112

国家自然科学基金资助项目(50475002). Received 20060603, received in revised form 20070109