Experimental Investigation of the Size Effects on the Fracture Toughness and Tearing Modulus

Zhao Xi Wang; Hui Ji Shi; Xiao Liang Zhang

doi:10.4028/www.scientific.net/AMR.33-37.35

Paper Titles

Effects of Distance and Alignment Holes on Fatigue Crack Behaviors of Cast Magnesium Alloys
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Research on the Plastic Work Rate Consumed in the Process Zone for the Growth of Triaxial-Stress-State Crack
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Study on Ductile Fracture Including Shear-Lip Fracture under Mixed Mode Loading Condition
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Fracture Analysis for Damaged Aircraft Fuselage Using Substructure Method
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Experimental Investigation of the Size Effects on the Fracture Toughness and Tearing Modulus
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Torsion Fracture Behavior of Drawn Pearlitic Steel Wires with Different Heat Treatments
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Analysis of Interfacial Debonding of RC Beams Strengthened with CFL
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Fatigue Crack Growth Simulations and Experimental Findings for SEN-Specimens under Different Loadings
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Regular Fracture Control of Pressed Notch Bar under Three-Point Bending
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Experimental Investigation of the Size Effects on the Fracture Toughness and Tearing Modulus

Abstract:

Detailed experiments of fracture toughness in which SENB specimens of five different thicknesses were included were carried out to investigate the size effect in the ductile to brittle transition temperature region. It is found that the fracture toughness of the upper shelf increases with the thickness of the specimens with the similar geometry. While the fracture toughness of the lower shelf decreases with the thickness in the range of 4mm to 12mm and then drops up from 12mm to 16mm with the appearance of shear lips which present the shearing fracture under the plane stress state. The tearing modulus dJ/da which determines the resistance to stable crack growth increases with the increment of thickness and the reduction of the temperature. The results of the stress triaxiality increasing with the reduction of the thickness explain well the experimental results.