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Imanaka, Makoto; Fujinami, Akinori; Suzuki, Yôichi

doi:10.1023/a:1004769719895

Cited by 27 publications

(19 citation statements)

References 12 publications

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“…Figure 4 shows the principal stress-strain relations in the adhesive layer of butt and scarf joints subjected to tensile load and of a butt joint with a thin-walled tube subjected to torsional load. These were obtained in the previous paper [13]. In the gure, the yield behavior is observed at every scarf angle.…”

Section: Stress -Strain Relations For the Scarf And Butt Jointssupporting

confidence: 59%

“…In the torsional tests on the butt joint with a thin-walled tube, a torque-controlle d torsional testing machine (50 N m capacity) was used at a torsional load speed of 27 N m /min. The detailed experimental procedures including the measuring method for the strain in the adhesive layer are described in the previous paper [13]. …”

Section: Adhesive Used and The Experimental Proceduresmentioning

confidence: 99%

“…In the gure, the stress triaxiality in the torsional . Stress-strain curves for butt joint (µ D 90 ± ) and scarf joints with different scarf angles subjected to tensile load, and butt joint with a thin-walled tube (µ D 0 ± ) subjected to torsional load [13].…”

Section: Stress -Strain Relations For the Scarf And Butt Jointsmentioning

confidence: 99%

“…5, the solid and dotted lines show the experimentally-obtaine d and calculated curves, respectively, where the effective void volume fraction V ¤ is used as a parameter for the calculated curves. In addition, the strain in the adhesive layer of the adhesively bonded joints was measured by a strain gage pasted across the adhesive layer whose thickness was adjusted to about 0.3 mm [13]. The output from the strain gage involves strain in the adherend; in calculating the principal Figure 5.…”

Section: Gurson's Modelmentioning

confidence: 99%

“…In a previous paper [13], using adhesively bonded scarf joints with a rubbermodi ed epoxy adhesive, the effect of stress multiaxialit y in the adhesive layer on the yield stress was investigate d [13]. In this study, in order to simulate yield stress in scarf joints, elastic-plastic stress analysis was conducted by a nite element method, where Gurson's constitutive equations were applied to the adhesive layer.…”

Section: Introductionmentioning

confidence: 99%

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Yield behavior of rubber-modified epoxy adhesives under multiaxial stress conditions

Imanaka¹,

Suzuki²

2002

Journal of Adhesion Science and Technology

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In rubber-modi ed epoxy resins, a damage zone is generated in the vicinity of the crack tip due to the cavitation of rubber particles, which improves fracture toughness dramatically. Hence, in evaluating the stress distribution in adhesive joints with rubber-modi ed adhesives, the void formation and growth should be taken into account. In most studies, however, the adhesive layer is still considered as a continuum material governed by the von Mises yield criterion. For many ductile materials, Gurson's model is used for the stress analysis, in which the void formation and growth is taken into account. In a previous study, using adhesively bonded scarf and torsional butt joints, the effect of stress triaxiality on the yield stress in the adhesive layer was investigated. In this study, these experimentally-obtained yield stresses were compared with those obtained by a nite element method, where Gurson's constitutive equations were applied to the adhesive layer. As a result, the calculated yield stresses agreed well with the experimentally-obtained yield stresses. This indicates that Gurson's model is a useful tool for estimating stress distributions in adhesive joints with rubbermodi ed adhesives.

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Section: Stress -Strain Relations For the Scarf And Butt Jointssupporting

confidence: 59%

Section: Adhesive Used and The Experimental Proceduresmentioning

confidence: 99%

Section: Stress -Strain Relations For the Scarf And Butt Jointsmentioning

confidence: 99%

Section: Gurson's Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Yield behavior of rubber-modified epoxy adhesives under multiaxial stress conditions

Imanaka¹,

Suzuki²

2002

Journal of Adhesion Science and Technology

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Inelastic Response of Structural Aerospace Adhesives

Chen¹,

Smith²

2023

Structural Adhesives

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Effect of matrix deformability on the fracture properties of epoxy resins modified with core–shell and cross‐linked rubber particles

Imanaka

Narita

Nakamura

et al. 2022

J of Applied Polymer Sci

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The effect of matrix deformability on the mechanical and fracture properties of epoxies containing dispersed core-shell rubber (CSR) and cross-linked rubber (CLR) particles was studied. The deformability of the matrix phase was varied using two types of curing agents, dicyandiamide (DICY) and piperidine, wherein the matrix phase cured with DICY has lower deformability than that cured with piperidine. Tensile and compression tests were conducted for the DICY-and piperidine-cured epoxies. Under tensile load conditions, typical for CSR-and CLR-modified epoxies, the DICY-cured epoxies were brittle, whereas the piperidine-cured epoxies failed under plastic deformation. Under compression loads, the 0.2% proof stresses of both rubber-modified epoxies cured by DICY were higher than those cured by piperidine, wherein the proof stresses for both the DICY-and piperidine-cured epoxies decreased with increasing rubber content. The results of fracture toughness tests for both types of cured epoxies indicated that the J-integral (J c ) values of the DICY-cured epoxy containing rubber particles were $0.3-0.5 times that of the piperidine-cured epoxy, which implied that the fracture toughness of the rubber-modified epoxies decreased with decreasing deformability of the matrix phase. In addition, the ratio of J c for CLR-modified epoxies to those of J c for CSR-modified epoxies for piperidine cured epoxies were about 1.5 times greater than those of DICY cured ones. Microscopy observations were conducted to explore the effect of the deformability of the matrix phase on the fracture mechanism.core-shell rubber particles, cross-linked rubber particles, epoxy resins, fracture toughness, matrix deformability | INTRODUCTIONHighly cross-linked epoxy resins have favorable properties, such as high modulus, high strength, and low creep at temperatures below their glass transition temperature.However, cross-linked epoxy resins are inherently brittle, which leads to poor resistance to crack initiation and propagation. Such properties limit their application as engineering materials. Hence, improving the fracture toughness is necessary to expand the range of

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Untitled

Cited by 27 publications

References 12 publications

Yield behavior of rubber-modified epoxy adhesives under multiaxial stress conditions

Yield behavior of rubber-modified epoxy adhesives under multiaxial stress conditions

Inelastic Response of Structural Aerospace Adhesives

Effect of matrix deformability on the fracture properties of epoxy resins modified with core–shell and cross‐linked rubber particles

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