Evaluation of impact fracture toughness of polymeric materials by means of the J-integral approach

2003 ◽  
Vol 43 (5) ◽  
pp. 1081-1095 ◽  
Author(s):  
Laura A. Fasce ◽  
Valeria Pettarin ◽  
Roc�o Seltzer ◽  
Patricia M. Frontini
Keyword(s):  
Fracture Toughness ◽  
Polymeric Materials ◽  
Impact Fracture ◽  
Integral Approach ◽  
J Integral

A Simple J-integral Approach for Fracture Toughness Assessment on Invalid Test Data of Standard CT Specimens

2006 ◽  
Vol 1 (2) ◽  
pp. 132-143 ◽  
Author(s):  
V.M.J. Sharma . ◽  
V. Diwakar . ◽  
K. Sree Kumar . ◽  
B. Nageswara Rao . ◽  
S.D. Pathak .
Keyword(s):  
Fracture Toughness ◽  
Test Data ◽  
Integral Approach ◽  
J Integral

Fracture Toughness of Irradiated HT-9 Weld Metal

1985 ◽  
Vol 107 (4) ◽  
pp. 329-333 ◽  
Author(s):  
F. H. Huang ◽  
D. S. Gelles
Keyword(s):  
Fracture Toughness ◽  
Weld Metal ◽  
Fracture Process ◽  
Irradiation Temperature ◽  
Integral Approach ◽  
J Integral ◽  
Test Results ◽  
Weld Material ◽  
Initiation Fracture Toughness ◽  
Scanning Electron

Fracture toughness tests were performed at 93, 205, 316, and 427°C using electropotential techniques on HT-9 weld material irradiated to a fluence of 2.35 × 1022 n/cm2 (E>0.1 MeV) at 390°C. Testing of welds irradiated at 450, 500, and 550°C was performed at 205°C. Test results were analyzed using the J-integral approach. It was found that the initiation fracture toughness of these HT-9 welds increased slightly, while the tearing modulus decreased significantly after irradiation to a fluence of 2.35 × 1022 n/cm2. In addition, results showed that irradiation temperature had little effect on the initiation fracture toughness of HT-9 weld metal. The specimens were examined by scanning electron microscopy after the test in order to understand the fracture process in this weld material.

scholarly journals IMPACT FRACTURE TOUGHNESS TEST OF CERAMIC REINFORCED METALS

1991 ◽  
Vol 01 (C3) ◽  
pp. C3-769-C3-774 ◽  
Author(s):  
S. TAKAHASHI ◽  
K. KISHIMOTO ◽  
S. AOKI
Keyword(s):  
Fracture Toughness ◽  
Impact Fracture ◽  
Fracture Toughness Test ◽  
Toughness Test

scholarly journals The elastic-plastic delamination analysis of layered beam configurations

2019 ◽  
Vol 39 (2) ◽  
pp. 165-173
Author(s):  
Victor Rizov
Keyword(s):  
Analytical Solutions ◽  
Strain Energy Release ◽  
Integral Approach ◽  
J Integral ◽  
Elastic Plastic ◽  
Crack Location ◽  
Layered Beams ◽  
Delamination Fracture ◽  
Non Linear ◽  
Point Bend

The elastic-plastic delamination fracture in layered beams was studied theoretically. Two Four Point Bend (FPB) beam configurations (the Double Leg Four Point Bend (DLFPB) and the Single Leg Four Point Bend (SLFPB)) were analyzed. An elastic-plastic constitutive model with power law hardening was used in the analysis. Fracture behavior was studied by applying the J-integral approach. The analytical solutions of the J-integral were obtained at characteristic levels of the external load. The solutions obtained were verified by analyzing the strain energy release rate with taking into account the material non-linearity. The variation of J-integral value in a function of crack location along the beam dept was investigated. The effect of material non-linearity on the fracture was evaluated. The analysis revealed that the J-integral value decreased with increasing the lower crack arm thickness. It was also found that the material non-linearity has to be taken into account in fracture mechanics based safety design of structural members and components made of layered materials. The analytical solutions obtained are very useful for non-linear investigations, since the simple formulae derived capture the essentials of non-linear fracture in the layered beams under consideration.

Fracture Toughness of PVC/NBR Blends Evaluated by the J-Integral

1993 ◽  
Vol 66 (4) ◽  
pp. 634-645
Author(s):  
N. Nakajima ◽  
J. L. Liu
Keyword(s):  
Fracture Toughness ◽  
Energy Dissipation ◽  
Crack Initiation ◽  
Crack Tip ◽  
J Integral ◽  
Integral Methods ◽  
Locus Method ◽  
Two Phases ◽  
Fracture Processes

Abstract The effect of gel on the fracture toughness of four PVC/NBR (50/50) blends was characterized by two different J- integral methods. Three of these blends are compatible blends with 33% acrylonitrile in NBRs, and the fourth with 21% acrylonitrile content, is an incompatible blend. Two types of gel are involved in this study microgels and macrogels. The J-integral methods are (1) conventional method proposed by Bagley and Landes and (2) crack initiation locus method proposed by Kim and Joe. The same load-displacement curves are used in both methods. However, the latter eliminates the energy dissipation away from the crack tip in the determination of Jc, while the former does not. Both methods produced almost the same results indicating that the energy dissipation away from the crack tip is negligible in these samples. The fracture toughness of a macrogel-containing blend is much greater than that of a microgel-containing blend, which, in turn, is only slightly greater than that of a gel-free blend. This implies that the two gel-containing blends have different fracture processes. The incompatible blend has the lowest fracture toughness due to weak interaction at the boundaries of the two phases.

Experimental evaluation of fracture properties of bovine hip cortical bone using elastic–plastic fracture mechanics

2021 ◽  
pp. 1-10
Author(s):  
Waseem Ur Rahman ◽  
Rafiullah khan ◽  
Noor Rahman ◽  
Ziyad Awadh Alrowaili ◽  
Baseerat Bibi ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Plastic Deformation ◽  
Fracture Mechanics ◽  
Cortical Bone ◽  
Elastic Deformation ◽  
Compact Tension ◽  
J Integral ◽  
Elastic Plastic ◽  
American Society ◽  
Fracture Specimens

BACKGROUND: Understanding the fracture mechanics of bone is very important in both the medical and bioengineering field. Bone is a hierarchical natural composite material of nanoscale collagen fibers and inorganic material. OBJECTIVE: This study investigates and presents the fracture toughness of bovine cortical bone by using elastic plastic fracture mechanics. METHODS: The J-integral was used as a parameter to calculate the energies utilized in both elastic deformation (Jel) and plastic deformation (Jpl) of the hipbone fracture. Twenty four different types of specimens, i.e. longitudinal compact tension (CT) specimens, transverse CT specimens, and also rectangular unnotched specimens for tension in longitudinal and transverse orientation, were cut from the bovine hip bone of the middle diaphysis. All CT specimens were prepared according to the American Society for Testing and Materials (ASTM) E1820 standard and were tested at room temperature. RESULTS: The results showed that the average total J-integral in transverse CT fracture specimens is 26% greater than that of longitudinal CT fracture specimens. For longitudinal-fractured and transverse-fractured cortical specimens, the energy used in the elastic deformation was found to be 2.8–3 times less than the energy used in the plastic deformation. CONCLUSION: The findings indicate that the overall fracture toughness measured using the J-integral is significantly higher than the toughness calculated by the stress intensity factor. Therefore, J-integral should be employ to compute the fracture toughness of cortical bone.

J-integral Fracture Toughness of High-Mn Steels at Room and Cryogenic Temperatures

2019 ◽  
Vol 50 (6) ◽  
pp. 2678-2689 ◽  
Author(s):  
Junhyeok Park ◽  
Kwanho Lee ◽  
Hyokyung Sung ◽  
Yong Jin Kim ◽  
Sung Kyu Kim ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
J Integral ◽  
Cryogenic Temperatures
Sign in / Sign up

Export Citation Format

Share Document