Application of Resistance Curves to Residual Strength Prediction

1978 ◽  
Vol 100 (2) ◽  
pp. 138-143 ◽  
Author(s):  
M. M. Ratwani ◽  
D. P. Wilhem
Keyword(s):  
Residual Strength ◽  
Crack Extension ◽  
Pressure Vessels ◽  
Strength Prediction ◽  
Thin Wall ◽  
Resistance Curve ◽  
Type Fracture ◽  
Thin Skin ◽  
Resistance Curves ◽  
Aircraft Panels

A resistance curve approach to predicting residual strength of thin-skin structures, under plane stress type fracture, is discussed. Use is made of material resistance obtained in terms of crack extension as a function of the square root of J(JR). Prediction has been made of the residual strength of two types of structures, namely stiffened aircraft panels and thin-wall cylindrical pressure vessels. Elastic-plastic analysis based on a Dugdale-type strip plastic zone is used in the residual strength prediction. The analytical results are compared with available experimental data.

The Relationship of the Resistance Curve and Gc to Specimen Configuration

1977 ◽  
Vol 28 (1) ◽  
pp. 28-38 ◽  
Author(s):  
N J I Adams ◽  
H G Munro
Keyword(s):  
Fracture Toughness ◽  
Plastic Zone ◽  
Aluminium Alloys ◽  
Crack Extension ◽  
Thin Sheet ◽  
Compact Tension ◽  
Resistance Curve ◽  
Resistance Curves ◽  
Relationship Of ◽  
The Relationship

SummaryFollowing a brief introduction, an examination is presented of the factors which define fracture toughness, resistance-curve relationships and the extent of stable crack extension in thin-sheet failure. Tests have been performed on three aluminium alloys to establish the variations in the shape of resistance curves, using both compliance-indicated and measured absolute values of crack length in compact tension specimens and centre crack sheets. The results show that both the toughness and the resistance curves of the two specimen types are different and that these differences cannot be explained wholly by consideration of crack tip plastic zone sizes.

scholarly journals Research on Residual Strength Prediction Model of Corroded Pipeline Based on Improved PSO-BP

2021 ◽  
Vol 687 (1) ◽  
pp. 012007
Author(s):  
Li Tingke ◽  
Peng Yuanchun ◽  
Li Jiadi ◽  
Dulin ◽  
Lian Xingqin
Keyword(s):  
Prediction Model ◽  
Residual Strength ◽  
Strength Prediction ◽  
Improved Pso

Application of the R-Curve Concept to Fatigue Crack Growth

1978 ◽  
Vol 100 (4) ◽  
pp. 416-420 ◽  
Author(s):  
D. P. Wilhem ◽  
M. M. Ratwani
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Crack Extension ◽  
Stress Ratio ◽  
Cyclic Stress ◽  
Crack Growth Resistance ◽  
Resistance Curve ◽  
Cyclic Stress Ratio ◽  
Wide Range

Crack growth resistance for both static (rising load) and for cyclic fatigue crack growth has been shown to be a continuous function over a range of 0.1 μm to 10 cm in crack extension for 2024-T3 aluminum. Crack growth resistance to each fatigue cycle of crack extension is shown to approach the materials ordinary undirectional static crack resistance value when the cyclic stress ratio is zero. The fatigue crack extension is averaged over many cycles and is correlated with the maximum value of the crack tip stress intensity, Kmax. A linear plot of crack growth resistance for fatigue and static loading data shows similar effects of thickness, stress ratio, and other parameters. The effect of cyclic stress ratio on crack growth resistance for 2219 aluminum indicates the magnitude of differences in resistance when plotted to a linear scale. Prediction of many of these trends is possible using one of several available crack growth data correlating techniques. It appears that a unique resistance curve, dependent on material, crack orientation, thickness, and stress/physical environment, can be developed for crack extensions as small as 0.076 μm (3 μ inches). This wide range, crack growth resistance curve is seen of immense potential for use in both fatigue and fracture studies.

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