Large deflection analysis of pneumatic envelopes using a penalty parameter modified material model

✍ Scribed by Xinxiang Liu; Christopher H. Jenkins; Willi W. Schur

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 602 KB
• Volume: 37
• Category: Article
• ISSN: 0168-874X
• DOI: 10.1016/s0168-874x(00)00040-8

✦ Synopsis

The computational challenge associated with pneumatic envelopes, such as balloons and parachutes, is due to the complication of their underconstrained and no-compression nature. Underconstrained behavior leads to large displacements without concomitant strain energy; no-compression behavior leads to a degenerate, wrinkled state. In this paper, we discuss issues surrounding modeling such structures. We provide a method to analyze pneumatic envelopes through a penalty parameter-modi"ed constitutive relation embedded in a non-linear "nite element code. Such an approach is also adaptable to the user-provided material function port available with many commercial "nite element codes. Validation examples given are the in#ated cantilever cylinder subjected to transverse tip load, in#ated cantilever cylinder subjected to twist moment, and the in#ation of a round parachute.