Nonisothermal deformation of a physically nonlinear material (polycarbonate) in a complex state of stress

1980 ◽  
Vol 15 (6) ◽  
pp. 659-663 ◽  
Author(s):  
A. A. Malmeister ◽  
Yu. O. Yanson
Keyword(s):  
Nonlinear Material ◽  
Complex State ◽  
State Of Stress ◽  
Physically Nonlinear Material ◽  
Nonisothermal Deformation

scholarly journals Longitudinal-transverse bending of a multilayer bar made of a physically nonlinear material

2020 ◽  
pp. 247-253
Author(s):  
Юрий Владимирович Немировский ◽  
Сергей Владимирович Тихонов
Keyword(s):  
Galerkin Method ◽  
Cross Section ◽  
Nonlinear Material ◽  
Constant Cross Section ◽  
Third Order ◽  
Transverse Loads ◽  
Transverse Bending ◽  
Physically Nonlinear Material ◽  
Deformation Law ◽  
Order Polynomial

В работе рассматриваются многослойные бетонные стержни постоянного поперечного сечения. Закон деформирования каждого слоя стержня принят в виде аппроксимации полиномом третьего порядка. Предполагается, что на защемленный стержень действуют квазистатические продольные и поперечные нагрузки и сила тяжести. Рассматриваемые задачи решаются методом Бубнова-Галеркина. The paper considers multilayer concrete rods of constant cross-section. The deformation law for each layer of the bar is adopted as an approximation by a third-order polynomial. It is assumed that quasi-static longitudinal and transverse loads and gravity act on the restrained rod. The problems under consideration are solved by the Bubnov-Galerkin method.

Stress and Buckling of Internally Pressurized, Elastic-Plastic Torispherical Vessel Heads—Comparisons of Test and Theory

1977 ◽  
Vol 99 (1) ◽  
pp. 39-53 ◽  
Author(s):  
D. Bushnell ◽  
G. D. Galletly
Keyword(s):  
Mild Steel ◽  
Large Deflection ◽  
Plastic Material ◽  
Material Behavior ◽  
Nonlinear Material ◽  
Test Results ◽  
Elastic Plastic ◽  
State Of Stress ◽  
Elastic Plastic Material ◽  
Good Agreement

Several aluminum and mild steel torispherical heads were tested by Galletly and by Kirk and Gill and subsequently analyzed by Bushnell with use of the BOSOR5 computer program. The thinnest specimens buckled at pressures for which part of the toroidal knuckle was stressed well beyond the yield point. The analysis includes large deflection effects, nonlinear material behavior, and meridional variation of the thickness. The calculated strains in the thicker specimens agree reasonably well with the test results, but the calculated prebuckling strains in the thinnest specimens are generally greater than the values measured in the torodial knuckle after the onset of plastic flow. Reasonably good agreement between test and theory is obtained for the buckling pressures of aluminum specimens, but the calculated buckling pressures for mild steel specimens are much lower than the observed values, a discrepancy that is attributed to circumferentially varying thickness and possible inability of the analytical model of the elastic-plastic material to predict accurately the state of stress in the toroidal knuckle where loading is nonproportional once yielding has occurred.

Sign in / Sign up

Export Citation Format

Share Document