Instantaneous evaluation of J and C

Paris, Anthony J.; Paris, Paul C.

doi:10.1007/bf00034281

Cited by 107 publications

(19 citation statements)

References 4 publications

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“…(2.4) for the red integration path gives = J Fθ b 2 / F , cf. Paris and Paris [14] and Biel and Stigh [15], where b is the width of the specimen in the out-of-plane direction. For the blue integration path, Eq.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Effects of strain rate on the cohesive properties and fracture process of a pressure sensitive adhesive

Stigh

Biel

2018

Engineering Fracture Mechanics

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Pressure sensitive adhesives provide beneficial properties for bi-material bonding and we here focus on influences of the loading rate. The cohesive law for a tape is measured using the J-integral method. In-situ studies of the fracture process are made. The fracture energy and cohesive law levels off below an engineering strain rate of about 2 s −1 . All the cohesive laws include two peak stresses, the first is associated with nucleation of cavities and occurs at a stress level comparable to the critical stress for cavitation in rubber. The second peak stress occurs just before final fracture when walls formed between the cavities break down. Slower rates give more time for cavities to nucleate. A similarity of the effects of loading rate and ageing is also identified.

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Section: Theoretical Backgroundmentioning

confidence: 99%

Effects of strain rate on the cohesive properties and fracture process of a pressure sensitive adhesive

Stigh

Biel

2018

Engineering Fracture Mechanics

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“…This method was used, rather than using a Linear Elastic Fracture Mechanics (LEFM) approach and GIc, due to the high toughness of the adhesive being used and also because the method did not require the measurement of the crack length, which could be complicated due to the patterns employed. During loading, the J value along the contour of the exterior boundary of the DCB specimen is [27,28] I…”

Section: Fracture Toughness Testingmentioning

confidence: 99%

Influence of surface micropatterns on the mode I fracture toughness of adhesively bonded joints

Sun

Pruncu

Penchev

et al. 2020

International Journal of Adhesion and Adhesives

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Surface patterning has been used to enhance the fracture toughness of adhesive joints. In this study, the effect of the variable bondline thickness introduced by the patterns and the effect of pattern geometry on the fracture behaviour of adhesive joints were analysed. Surface patterns including longitudinal grooves, transverse grooves, dimples and grids were fabricated by means of laser texturing. The patterned surfaces were bonded using a tough structural adhesive and the mode I fracture toughness was measured using the J-integral method. The toughness of the patterned joints was compared with the results from bonding with control surfaces and with grit blasted in combination with chromic acid etched (GB-CAE) surfaces. It was shown that both longitudinal and transverse grooves led to the highest value of toughness. Grids patterns yielded a toughness close to the GB-CAE treatment, both of which were higher than the dimple patterns. It was also shown that the variable bondline thickness due to the existence of surface patterns, which influences the size of the plastic zone, reduced rather than increased the fracture toughness.

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“…In the following, we will briefly present the necessary equations for the evaluation of the conducted experiments in modes I and III and state the most important findings of prior studies. For more detailed derivations, we would like to refer to relevant literature, e.g., [10,11,14,19,20].…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…is an unintended contribution in modes I and II due to the finite width of the specimen. The instantaneous experimental determination of the ERR based on the J-integral is relatively unsophisticated in mode I, as only force and rotational angle at the points of load introduction have to be measured [10]. To obtain the curvature κ in mode III, an increased experimental effort and the use of additional measuring equipment are required.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…To determine the fracture mechanical properties of POM and possibly other polymers in both pure modes I and III, we propose experimental setups based on the double cantilever beam (DCB) and out-of-plane double cantilever beam (ODCB) tests evaluated by using the J-integral. DCB tests with this method of data reduction have historically mostly been used for the experimental investigation of adhesives or composites, see [10][11][12][13] for example, whereas the ODCB test was exclusively used for the investigation of adhesives thus far [14]. The proposed modifications to the DCB and ODCB tests offer the possibility to determine the fracture energy in pure modes I and III on the basis of the J-integral.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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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.

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Instantaneous evaluation of J and C

Cited by 107 publications

References 4 publications

Effects of strain rate on the cohesive properties and fracture process of a pressure sensitive adhesive

Effects of strain rate on the cohesive properties and fracture process of a pressure sensitive adhesive

Influence of surface micropatterns on the mode I fracture toughness of adhesively bonded joints

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

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