Effects of Lay-Up, Temperature, and Loading Rate in Double Cantilever Beam Tests of Interlaminar Crack Growth

1983 ◽  
Vol 5 (4) ◽  
pp. 118 ◽  
Author(s):  
WW Feng ◽  
KL Reifsnider ◽  
GP Sendeckyj ◽  
TT Chiao ◽  
GL Rodericks ◽  
...  
Keyword(s):  
Crack Growth ◽  
Cantilever Beam ◽  
Loading Rate ◽  
Double Cantilever Beam ◽  
Interlaminar Crack

Effect of loading rate on cohesive parameters of the adhesive Araldite 2015

2020 ◽  
Vol 62 (9) ◽  
pp. 943-950
Author(s):  
Engin Erbayrak ◽  
Halil Ozer
Keyword(s):  
Fracture Toughness ◽  
Plastic Deformation ◽  
Fracture Energy ◽  
Transition Region ◽  
Cantilever Beam ◽  
Epoxy Matrix ◽  
Loading Rate ◽  
Double Cantilever Beam ◽  
Loading Rates ◽  
Softening Behavior

Abstract This study addresses the effect of loading rates on cohesive parameters and microstructural composition of the Araldite 2015 adhesive. Double Cantilever Beam (DCB) samples were tested under the loading rates of 1, 5, 10, 20, 100 and 200 mm × min-1. The Park-Paulinho-Roeser model (PPR model) was used to get cohesive parameters. In modelling of the softening behavior, inverse analyses were performed using the date obtained from the PPR softening curves. It was seen that the fracture energy and cohesive parameters are decreasing with increasing the loading rate. However, there seems to be a transition region where the fracture energy nearly remains constant. Microstructural analyses were implemented in order to study the effects of the loading rates on the characteristics of the fracture surfaces. It was concluded that the loading rates greatly influence the distribution of micro-voids in the epoxy matrix. Moreover, the presence of voids in epoxy matrix improved the plastic deformation around the crack tip and increased the fracture toughness.

Crack growth of natural rubber using a modified double cantilever beam

2002 ◽  
Vol 34 (8) ◽  
pp. 451-458 ◽  
Author(s):  
Joseph T South ◽  
Scott W Case ◽  
Kenneth L Reifsnider
Keyword(s):  
Natural Rubber ◽  
Crack Growth ◽  
Cantilever Beam ◽  
Double Cantilever Beam

scholarly journals Fracture of Thin-Walled Polyoxymethylene Bulk Specimens in Modes I and III

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5096
Author(s):  
Peer Schrader ◽  
Anja Gosch ◽  
Michael Berer ◽  
Stephan Marzi
Keyword(s):  
Fracture Surface ◽  
Crack Growth ◽  
Cantilever Beam ◽  
Double Cantilever Beam ◽  
Polymeric Materials ◽  
Local Mode ◽  
Mode I ◽  
Mode Iii ◽  
Thin Walled ◽  
Twisting Angle

Thin-walled polymeric components are used in many applications. Hence, knowledge about their fracture behavior in bulk is beneficial in practice. Within this study, the double cantilever beam (DCB) and out-of-plane double cantilever beam (ODCB) tests are enhanced to enable the testing of such bulk specimens in mode I and mode III on the basis of the J-integral. This paper then presents and discusses the experimental results following the investigation of a semicrystalline polymer (polyoxymethylen) under quasi-static load conditions. From the experiments, fracture energies of similar magnitude in both mode I and mode III were determined. In mode III, pop-in fracture was observed. Furthermore, the fracture surfaces were investigated regarding the mode I and mode III dominant crack growth mechanisms, based on the morphology of the tested material. For specimens tested in mode I, no signs of plastic deformation were observed, and the fracture surface appears flat. In mode III, some samples display a twisted fracture surface (twisting angle close to 45°), which indicates local mode I crack growth. A transfer of the presented methodology to other (more ductile) polymeric materials is deemed possible without further restrictions. In addition, the presented setup potentially enables an investigation of polymeric bulk specimens in mixed mode I+III.

Use of Precracked Specimens in Stress Corrosion Testing of High Strength Aluminum Alloys

CORROSION ◽  
1970 ◽  
Vol 26 (11) ◽  
pp. 487-503 ◽  
Author(s):  
M. V. HYATT
Keyword(s):  
Aluminum Alloys ◽  
Stress Corrosion ◽  
Crack Growth ◽  
Cantilever Beam ◽  
Growth Rates ◽  
Double Cantilever Beam ◽  
High Strength ◽  
Beam Specimen ◽  
High Strength Aluminum Alloys ◽  
Crack Growth Rates

Abstract Resistance to stress corrosion cracking of 10 high strength aluminum alloys in a variety of heat treatment conditions has been measured using precracked double cantilever beam (DCB) specimens. A new technique is described, and stress corrosion crack growth rates for the alloys tested are presented as a function of the plane-strain stress intensity KI. Crack growth rates for alloys in the T3 and T6 tempers showed both KI-independent and KI-dependent behavior, whereas alloys in the more resistant tempers showed only KI independent behavior over the KI range studied. Double cantilever beam specimen data correlated with established trends from smooth specimens tested by alternate immersion in 3.5% NaCl solution. From the crack growth rate data and the speed and simplicity with which it is obtained, it is concluded that the DCB specimen will be highly useful for (1) comparing and rating alloys, (2) developing new alloys and heat treatments, (3) comparing the effects of environments, (4) achieving or ensuring product uniformity, and (5) studying mechanisms of cracking.

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