Analysis of residual stresses in bars and tubes of cylindrically orthotropic materials

1966 ◽  
Vol 6 (9) ◽  
pp. 451-457 ◽  
Author(s):  
W. A. Olson ◽  
C. W. Bert
Keyword(s):  
Residual Stresses ◽  
Orthotropic Materials ◽  
Cylindrically Orthotropic

Novel two-level strategy to exactly solve multilayer composite cantilever tubes of cylindrically orthotropic materials

2020 ◽  
Vol 237 ◽  
pp. 111866
Author(s):  
Canhui Zhang ◽  
Ruijie Chang ◽  
An Li
Keyword(s):  
Orthotropic Materials ◽  
Multilayer Composite ◽  
Cylindrically Orthotropic

Mechanical Property Tests for Cylindrically Orthotropic Materials

1969 ◽  
Vol 3 (1) ◽  
pp. 136-147 ◽  
Author(s):  
Leonard R. Herrmann ◽  
S.T.K. Chan
Keyword(s):  
Mechanical Property ◽  
Orthotropic Materials ◽  
Cylindrically Orthotropic

An inverse solution for winding stresses in wound coils of linear orthotropic material with large deformations

2007 ◽  
Vol 221 (6) ◽  
pp. 639-652 ◽  
Author(s):  
F R de Hoog ◽  
M Cozijnsen ◽  
W Y D Yuen
Keyword(s):  
Residual Stresses ◽  
Orthotropic Material ◽  
Large Deformations ◽  
Previous Analysis ◽  
Inverse Solution ◽  
Orthotropic Materials ◽  
Stress Profile ◽  
Solution Approach ◽  
Small Deformations

This paper extends a previous analysis of determining the winding stress in coils, using an inverse solution approach to coils with large deformations of linear orthotropic materials. This approach has the advantage of determining the required winding stress profile explicitly once the desired residual stresses in the coil to avoid post-winding defects are known. Comparisons between the theories for small and large deformations are also made, with coil properties, where the small deformations assumption is inappropriate, are identified.

scholarly journals Measurement and Analysis of Residual Stresses and Warpage in Fiber Reinforced Plastic and Hybrid Components

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 335
Author(s):  
Tao Wu ◽  
Steffen Tinkloh ◽  
Thomas Tröster ◽  
Wolfgang Zinn ◽  
Thomas Niendorf
Keyword(s):  
Residual Stresses ◽  
Process Parameters ◽  
Composite Structures ◽  
Mechanical Performance ◽  
Orthotropic Materials ◽  
Hole Drilling ◽  
Drilling Process ◽  
Fiber Reinforced ◽  
Fiber Reinforced Plastic ◽  
Reinforced Plastic

Glass/carbon fiber reinforced plastic (GFRP/CFRP) and hybrid components have attracted increasing attention in lightweight applications. However, residual stresses induced in the manufacturing process of these components can result in warpage and, eventually, negatively affect the mechanical performance of the composite structures. In the present work, GFRP, CFRP, GFRP/steel and CFRP/steel hybrid components were manufactured through the prepreg-press-technology always employing the same process parameters. The residual stresses of these components were measured through the hole drilling method (HDM), based on an adequate formalism to evaluate the residual stresses for orthotropic materials including the calculation of the calibration coefficients via finite element analysis (FEA). In FEA, the real material lay-up and mechanical properties of the samples were considered. The warpage induced by residual stresses was measured after the samples were removed from the tool. The measured residual stresses and warpage of four different types of samples were compared and results were analyzed in depth. The results obtained can be extended to other hybrid materials and even could be used for designing multi-stable laminates for application in adaptive structures. Moreover, the effects of the drilling process parameters of HDM, e.g., the drilling speed, the drilling increment and the zero-depth setting, on the resulting residual stresses of GFRP were investigated. The reliability of residual stress measurements in GFRP using HDM was validated through mechanical bending tests. The conclusions concerning the choice of optimal drilling parameters for GFRP could be directly applied for other types of samples considered in the present work.

scholarly journals A Method for Measuring Planar Residual Stresses in Rectangularly Orthotropic Materials

1968 ◽  
Vol 2 (2) ◽  
pp. 244-253 ◽  
Author(s):  
Charles W. Bert ◽  
Gary L. Thompson
Keyword(s):  
Residual Stresses ◽  
Orthotropic Materials

Shrinkage stresses in wood logs considered as layered, cylindrically orthotropic materials

1977 ◽  
Vol 11 (1) ◽  
pp. 51-58 ◽  
Author(s):  
T. R. Tauchert ◽  
N. N. Hsu
Keyword(s):  
Orthotropic Materials ◽  
Cylindrically Orthotropic

Residual-stress determination of concentric layers of cylindrically orthotropic materials

1987 ◽  
Vol 27 (3) ◽  
pp. 290-297 ◽  
Author(s):  
G. Z. Voyiadjis ◽  
C. S. Hartley
Keyword(s):  
Residual Stress ◽  
Orthotropic Materials ◽  
Stress Determination ◽  
Residual Stress Determination ◽  
Cylindrically Orthotropic

scholarly journals Determination and Validation of Residual Stresses in CFRP/Metal Hybrid Components Using the Incremental Hole Drilling Method

2020 ◽  
Vol 4 (3) ◽  
pp. 143
Author(s):  
Tao Wu ◽  
Steffen R. Tinkloh ◽  
Thomas Tröster ◽  
Wolfgang Zinn ◽  
Thomas Niendorf
Keyword(s):  
Residual Stresses ◽  
Hybrid Materials ◽  
Strain Gauge ◽  
Bending Test ◽  
Orthotropic Materials ◽  
Hole Drilling ◽  
Metallic Component ◽  
Hole Drilling Method ◽  
Incremental Hole Drilling ◽  
Drilling Method

Lightweight materials contribute to an efficient decrease in fuel consumption in the automotive and aircraft industries. Hybrid components made of metal and carbon fiber-reinforced plastics (CFRP) have a high potential in lightweight applications due to their high strength-to-weight ratio. For cost-effective processing of hybrid materials, advanced manufacturing processes such as the prepreg-press-technology have been developed, in which the bonding between a metallic component and a fiber compound is exclusively realized in the forming process. However, upon processing of these hybrid components at elevated temperature, the difference in thermal expansion coefficients of the two materials leads to the formation of tensile residual stresses upon cooling. It is well known that these tensile residual stresses can be detrimentally effective with respect to the durability of a hybrid component. The objective of this work is to accurately measure and analyze residual stresses in hybrid components made of unidirectional CFRP and steel through the incremental hole drilling method. Within this study, the evaluation formalism for orthotropic materials is employed for measuring non-uniform residual stresses in hybrid materials. In order to improve the measurement accuracy, a customized strain gauge with eight grids is employed and a drilling increment size of only 20 µm is utilized. The influence of the angle between the strain gauge rosette and the fiber direction on the evaluation of the residual stresses is investigated. In order to evaluate the reliability of the results determined, a bending test applying a well-defined load is carried out. By direct comparison of the experimentally determined stresses and stress values calculated by the finite element method, the applicability of the hole drilling method for robust determination of residual stresses in CFRP/metal hybrid components is finally validated.

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