scholarly journals Influence of Root Rotation on Delamination Fracture Toughness of Composites

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
V. Alfred Franklin ◽  
T. Christopher ◽  
B. Nageswara Rao
Keyword(s):  
Fracture Toughness ◽  
Cantilever Beam ◽  
Double Cantilever Beam ◽  
Test Results ◽  
Spring Stiffness ◽  
Critical Fracture ◽  
Delamination Fracture ◽  
Dcb Specimen ◽  
Material Systems ◽  
Good Agreement

Large deviations have been observed while analysing composite double cantilever beam (DCB) specimens assuming each cracked half as a simple cantilever beam. This paper examines the effect of rotational spring stiffness(K)on the critical fracture energy(GIC)considering nonzero slope at the crack-tip of the DCB specimen by modelling each cracked half as the spring-hinged cantilever beam. The critical load estimates of DCB specimens fromGICare found to be in good agreement with in-house and existing test results of different composite material systems.

On the Use of the Double Cantilever Beam Specimen for Determining the Plane Strain Fracture Toughness of Metals

1967 ◽  
Vol 89 (3) ◽  
pp. 525-532 ◽  
Author(s):  
R. G. Hoagland
Keyword(s):  
Fracture Toughness ◽  
Plane Strain ◽  
Cantilever Beam ◽  
Double Cantilever Beam ◽  
Elastic Strain Energy ◽  
Strain Energy Release ◽  
Crack Arrest ◽  
Specimen Geometry ◽  
Beam Specimen ◽  
Dcb Specimen

The double cantilever beam (DCB) specimen has considerable potential for application to fracture toughness testing because it facilitates the determination of a number of plane strain toughness data from a single specimen of moderate size. The relationship between the elastic strain energy release rate, load, and extension for a given crack length is obtained from compliance tests and the dependence of this relationship on the specimen geometry is presented. The effect of changing specimen geometry on the fracture toughness is also presented. Comparison with plane strain toughness data obtained by other techniques on identical materials is made to evaluate the effectiveness of the side grooves in the specimen for providing plane strain conditions at fracture. Finally, consideration of the meaning of the stress intensity at crack arrest in the DCB specimen indicates that this parameter is dependent on specimen geometry as well as the material properties.

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.

Finite Element Analysis of Dry Shrinkage of Fiber Cement Mortar

2014 ◽  
Vol 590 ◽  
pp. 312-315
Author(s):  
Wei Hong Xuan ◽  
Pan Xiu Wang ◽  
Yu Zhi Chen ◽  
Xiao Hong Chen
Keyword(s):  
Fracture Toughness ◽  
Cement Mortar ◽  
Polypropylene Fiber ◽  
Polypropylene Fibers ◽  
Test Results ◽  
Ansys Software ◽  
Element Analysis ◽  
Cement Based Materials ◽  
Dry Shrinkage ◽  
Good Agreement

The dry shrinkage deformation of polypropylene fiber mortar was analyzed by ANSYS software and compared with experiment value in this paper. The error of the calculated and experimental results in the 14 days and 28 days are 7.8% and 10.5%. It can be found that the calculated results are in good agreement with test results. The results indicate that the dry shrinkage value of polypropylene fiber mortar is lower than ordinary mortar. Adding polypropylene fibers can inhibit the process of cracking and improve the fracture toughness of cement-based materials.

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