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Ashkan Vaziri's picture

Localized and extended deformations of elastic shells - Ashkan Vaziri & L. Mahadevan, Early Edition PNAS

Submitted by Ashkan Vaziri on Tue, 2008-06-03 19:31.

The dried raisin, the crushed soda can, and the collapsed bicycle inner tube exemplify the nonlinear mechanical response of naturally curved elastic surfaces with different intrinsic curvatures to a variety of different external loads. To understand the formation and evolution of these features in a minimal setting, we consider a simple assay: the response of curved surfaces to point indentation.


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Ying Li's picture

著名力学家叶开沅先生逝世

Submitted by Ying Li on Mon, 2007-10-22 08:22.

我国著名力学家、中国力学学会原常务理事、甘肃省力学学会原理事长、甘肃省政协原常委
、甘肃省科协原常委、兰州大学力学专业和学科的创始人、兰州大学力学系首任主任、名誉
主任叶开沅先生因病医治无效，于2007年10月20日15时30分在北京不幸逝世，享年82岁。
　　叶开沅，男，汉族，1926年5月19日出生于浙江省衢州市。1938年至1943年，在浙江省
立衢州中学学习。1944年，到北京灯市口育英中学学习。1945年考入北京大学土木工程系，
旋即转入燕京大学数学系学习。1946年，进入唐山工程学院学习，1947年转入清华大学电机


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Amit Acharya's picture

Does a radially expanding cylinder bend?

Submitted by Amit Acharya on Tue, 2007-05-15 16:42.

 The Koiter-Sanders-Budiansky bending strain measure and a nonlinear generalization

 We know from strength of materials that non-uniform stretching of fibers along the cross section of a beam produces bending moments. But does this situation necessarily correspond to a 'bending' deformation? For that matter, what do we exactly mean kinematically when we talk about a bending deformation?

To make the question more concrete, consider a cylinder that expands uniformly along all radial rays. Does this deformation of the cylinder correspond to bending? I think it is fair to say that most would say that this is purely a stretching deformation with no bending. But then, what is precisely a bending deformation?


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