Elastostatics of Cubic Boxes Subjected to Pressure

1977 ◽  
Vol 99 (4) ◽  
pp. 568-574 ◽  
Author(s):  
A. J. Durelli ◽  
V. Pavlin ◽  
J. O. Buhler-Vidal
Keyword(s):  
Wall Thickness ◽  
Elastic Material ◽  
Experimental Analysis ◽  
Strain Analysis ◽  
Stress And Strain ◽  
Experimental Stress ◽  
Strain Gages ◽  
Families Of Curves ◽  
Electrical Strain Gages

This paper deals with the experimental stress and strain analysis of cubic boxes subjected to pressure. The models manufactured had inside-span-to-wall-thickness ratios varying from approximately 5 to 14. All internal corners had circular fillets. The experimental analysis was conducted using electrical strain gages, brittle coatings and photoelasticity. Results, given parametrically by means of families of curves representing normalized stresses are applicable to boxes of any size, made of any elastic material, provided the span-to-wall-thickenss ratio falls within the range studied. Results obtained using the theory of structures approach are included for comparison purposes and presented in a form useful to designers.

The Simulation about the Reliability and Fatigue Analysis of Tower at Connecting Region of Cylinder and Skirt

2012 ◽  
Vol 522 ◽  
pp. 535-541
Author(s):  
Ya Xin Zhang ◽  
Qi Gao ◽  
Yin Chang Ma ◽  
Xin Jian Zhang ◽  
Ting Zhao
Keyword(s):  
Experimental Analysis ◽  
Strain Analysis ◽  
Structure Optimization ◽  
Fatigue Analysis ◽  
Stress And Strain ◽  
Distillation Tower ◽  
Chemical Company ◽  
Large Size ◽  
The Common

The reliability and fatigue analysis of tower at the connecting region of cylinder and skirt are very significance to tower safety. Because of large size, the common way by experimental analysis is almost impossible to achieve. In this article, to the distillation tower using in some petro-chemical company of Xinjiang, the stress and strain analysis, reliability and fatigue analysis at the connecting region of cylinder and skirt are performed by FEM. Based on the conclusions above, the main parameters which affect reliability are determined and some suggestions about structure optimization are proposed.

Experimental Characterization of the Mechanical Behavior of Concrete Bars in the Tensile Test

2012 ◽  
Vol 498 ◽  
pp. 97-102
Author(s):  
B. Hortigón ◽  
E.J. Nieto ◽  
F.F. Ancio ◽  
O. Hernández
Keyword(s):  
Tensile Test ◽  
Experimental Analysis ◽  
Finite Deformation ◽  
Strain Field ◽  
Strain Analysis ◽  
Stress And Strain ◽  
Plastic Behavior ◽  
Experimental Characterization ◽  
Flow Evolution

Necking process stress and strain analysis, which is key to determine the plastic flow evolution in finite deformation, has been widely studied and applied to a number of materials based on the theories established by Davidenkov-Spiridnova and Bridgman in the 40s decade. These theories envolve from the study of necking geometry in fracture. In this paper, we develop an exhaustive experimental analysis of the stress and strain field in the necking process, applied to concrete bars and mechanized samples with similar features, in order to compare the results with the ones given by the theories listed above and to look for the corrugation influence in the materials plastic behavior.

Stress Analysis of Tire Sections

1996 ◽  
Vol 24 (4) ◽  
pp. 349-366 ◽  
Author(s):  
T-M. Wang ◽  
I. M. Daniel ◽  
K. Huang
Keyword(s):  
Finite Element ◽  
Internal Pressure ◽  
Stress Analysis ◽  
Strain Analysis ◽  
Experimental Stress ◽  
Inflation Pressure ◽  
Substantial Agreement ◽  
Finite Element Stress Analysis ◽  
Strain Components ◽  
Fringe Patterns

Abstract An experimental stress-strain analysis by means of the Moiré method was conducted in the area of the tread and belt regions of tire sections. A special loading fixture was designed to support the tire section and load it in a manner simulating service loading and allowing for Moiré measurements. The specimen was loaded by imposing a uniform fixed deflection on the tread surface and increasing the internal pressure in steps. Moiré fringe patterns were recorded and analyzed to obtain strain components at various locations of interest. Maximum strains in the range of 1–7% were determined for an effective inflation pressure of 690 kPa (100 psi). These results were in substantial agreement with results obtained by a finite element stress analysis.

Indicial response functions of growth and remodeling of common bile duct postobstruction

2004 ◽  
Vol 286 (3) ◽  
pp. G420-G427 ◽  
Author(s):  
Quang Dang ◽  
Hans Gregersen ◽  
Birgitte Duch ◽  
Ghassan S. Kassab
Keyword(s):  
Bile Duct ◽  
Common Bile Duct ◽  
Wall Thickness ◽  
Time Course ◽  
Quantitative Description ◽  
Biliary Duct ◽  
Stress And Strain ◽  
Response Functions ◽  
Mechanical Remodeling ◽  
Scheduled Time

Biliary duct obstruction is an important clinical condition that stems from cholelithiasis, the neoplasm in the wall or, most commonly, gallbladder stones. The objective of this study is to understand the structural and mechanical remodeling of the common bile duct (CBD) postobstruction. Porcine CBD was ligated near the duodenum that increased the duct's pressure from 6.4 to 18.3 cmH2O in the first 12 h and to 30.7 cmH2O after 32 days. The remodeling process was studied after 3 h, 12 h, 2 days, 8 days, and 32 days ( n = 5 in each group) after obstruction. One additional animal in each group was sham operated. At each scheduled time, the time course of change of morphometry (diameter, length, wall thickness, etc.) and mechanical properties (stress, strain, etc.) was documented. It was found that the diameter increased by about threefold and the wall thickness of the CBD doubled in the 32-day group compared with the sham group ( P < 0.001). The stress and strain increased initially with increase in pressure but recovered to near the control values by day 32 due to the structural and mechanical adaptations. Hence, the net effect of the structural and mechanical remodeling is to restore the stress and strain to their homeostatic values. Furthermore, the strain recovers more rapidly and more completely than stress. Finally, the remodeling data were expressed mathematically in terms of indicial response functions (IRF), i.e., change of a particular feature of a CBD in response to a unit step change of the pressure. The IRF approach provides a quantitative description of the remodeling process in the CBD.

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