Techno Press


Structural Engineering and Mechanics   Volume 11, Number 3, March 2001, pages 315-324
DOI: http://dx.doi.org/10.12989/sem.2001.11.3.315
 
Viscoplastic collapse of titanium alloy tubes under cyclic bending
Kuo-Long lee and Wen-Fung Pan(R.O.C.)

 
Abstract     [Full Text]
    This paper presents the experimetal result on the viscoplastic response and collapse of the
titanium alloy tubes subjected to cyclic bending. Based on the capacity of the bending machine, three
different curvature-rates were used to highlight the viscoplastic behavior of the titanium alloy tubes. The
Curvature-controlled experiments were conducted by the curvature-ovalization measurement apparatus which
was designed by Pan et al. (1998). It can be observed from experimental data that the higher the applied
curvature-rate, the greater is the degree of hardening of titanium alloy tube. However, the higher the
applied curvature-rate, the greater is the degree of ovalization of tube cross-section. Furthermore, due to
the greater degree of the ovalization of tube cross-section for higher curvature-rates under cyclic bending,
the number of cycles to produce buckling is correspondingly reduced. Finally, the theoretical formulation,
proposed by Pan and Her (1998), was modified so that it can be used for simulating the relationship
between the controlled curvature and the number of cycles to produce buckling for titanium alloy tubes
under cyclic bending with different curvature-rates. The theoretical simulation was compared with the
experimental test data. Good agreement between the experimental and theoretical results has been achieved.
 
Key Words
    titanium alloy tube; viscoplastic collapse; cyclic bending; curvature; ovalization.
 
Address
Kuo-Long Lee, Department of Mechanical Engineering, Far East College, Tainan, Taiwan, R.O.C.
Wen-Fung Pan, Department of Engineering Science, National Cheng Kung University, Tainan, Taiwan, R.O.C.
 

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