Effect of surface residual stress on the fracture of double cantilever beam fracture toughness specimen

2013 ◽  
Vol 113 (15) ◽  
pp. 153502 ◽  
Author(s):  
B. L. Wang ◽  
K. F. Wang
Keyword(s):  
Fracture Toughness ◽  
Residual Stress ◽  
Cantilever Beam ◽  
Double Cantilever Beam ◽  
Surface Residual Stress ◽  
Fracture Toughness Specimen ◽  
Effect Of Surface

Fracture toughness of PMMA as measured with indentation cracks

1993 ◽  
Vol 8 (12) ◽  
pp. 3210-3217 ◽  
Author(s):  
S.R. Choi ◽  
J.A. Salem
Keyword(s):  
Fracture Toughness ◽  
Residual Stress ◽  
Cantilever Beam ◽  
Reasonable Agreement ◽  
Double Cantilever Beam ◽  
Compact Tension ◽  
Indentation Load ◽  
Poor Agreement ◽  
Single Edge ◽  
Liquid Acetone

Fracture toughness of polymethyl methacrylate (PMMA) was evaluated with indentation cracks. The cracks were developed by indenting in a liquid acetone environment, as suggested by previous researchers. Due to the inconsistency in crack configurations with varying indentation loads and to the negligible residual stress from indentation, the application of the indentation strength method was limited in evaluating fracture toughness of PMMA. The semielliptical crack approximation, however, particularly at a low indentation load of 9.8 N, resulted in reasonable agreement with the value determined by three conventional fracture toughness testings using the compact tension (CT), double cantilever beam (DCB), and single edge notched beam (SENB) specimens. Measurements at other indentation load typically were in poor agreement with conventional methods due to poorly developed crack configurations.

Double Cantilever Beam Measurement and Finite Element Analysis of Cryogenic Mode I Interlaminar Fracture Toughness of Glass-Cloth/Epoxy Laminates

2000 ◽  
Vol 123 (2) ◽  
pp. 191-197 ◽  
Author(s):  
Y. Shindo ◽  
K. Horiguchi ◽  
R. Wang ◽  
H. Kudo
Keyword(s):  
Fracture Toughness ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Cantilever Beam ◽  
Double Cantilever Beam ◽  
Mode I ◽  
Interlaminar Fracture Toughness ◽  
Element Analysis ◽  
Interlaminar Fracture ◽  
Delamination Crack

An experimental and analytical investigation in cryogenic Mode I interlaminar fracture behavior and toughness of SL-E woven glass-epoxy laminates was conducted. Double cantilever beam (DCB) tests were performed at room temperature (R.T.), liquid nitrogen temperature (77 K), and liquid helium temperature (4 K) to evaluate the effect of temperature and geometrical variations on the interlaminar fracture toughness. The fracture surfaces were examined by scanning electron microscopy to verify the fracture mechanisms. A finite element model was used to perform the delamination crack analysis. Critical load levels and the geometric and material properties of the test specimens were input data for the analysis which evaluated the Mode I energy release rate at the onset of delamination crack propagation. The results of the finite element analysis are utilized to supplement the experimental data.

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