scholarly journals Validity of the Adhesive Strength Evaluation Method Based on the Intensity of Singular Stress Field in Two-Dimensional Modelling

2018 ◽  
Vol 21 (4) ◽  
pp. 299-310 ◽  
Author(s):  
Nao-aki Noda ◽  
Fei Ren ◽  
Rei Takaki ◽  
Kenji Tsuboi ◽  
Yoshikazu Sano ◽  
...  
Keyword(s):  
Stress Field ◽  
Adhesive Strength ◽  
Evaluation Method ◽  
Two Dimensional ◽  
Singular Stress ◽  
Strength Evaluation ◽  
Singular Stress Field

Convenient Adhesive Strength Evaluation Method in Terms of the Intensity of Singular Stress Field

2018 ◽  
Vol 16 (01) ◽  
pp. 1850085 ◽  
Author(s):  
Nao-Aki Noda ◽  
Rong Li ◽  
Tatsujiro Miyazaki ◽  
Rei Takaki ◽  
Yoshikazu Sano
Keyword(s):  
Stress Field ◽  
Conventional Method ◽  
Adhesive Strength ◽  
Evaluation Method ◽  
Singular Stress ◽  
Strength Evaluation ◽  
Present Solution ◽  
Singular Stress Field

A convenient evaluation method is proposed for the debonding adhesive strength in terms of the intensity of singular stress field (ISSF) appearing at the end of interface. The same FEM mesh pattern is applied to unknown problems and reference problems. It is found that the ISSF is obtained accurately by focussing on the FEM stress at the adhesive corner. Then, the debonding condition can be expressed as a constant value of critical ISSF. The usefulness of the present solution is verified by comparing with the results of the conventional method.

Intensity of Singular Stress Field for Three-Dimensional Butt Joint to Evaluate the Adhesive Strength

2018 ◽  
Vol 2018.71 (0) ◽  
pp. D31
Author(s):  
Mohd Radzi ARIDI ◽  
Nao-Aki NODA ◽  
Kenji TSUBOI ◽  
Rei TAKAKI ◽  
Fei REN ◽  
...  
Keyword(s):  
Stress Field ◽  
Adhesive Strength ◽  
Three Dimensional ◽  
Butt Joint ◽  
Singular Stress ◽  
Singular Stress Field

Empirical Formula for Stress Intensity Factor of Crack Initiated from an Interface Edge

2013 ◽  
Vol 645 ◽  
pp. 377-380
Author(s):  
Zhen Yang
Keyword(s):  
Stress Intensity ◽  
Numerical Analysis ◽  
Fracture Mechanics ◽  
Stress Field ◽  
Empirical Formula ◽  
Evaluation Method ◽  
Singular Stress ◽  
Edge Singularity ◽  
Singular Stress Field ◽  
Interface Edge

Bi-material has been widely used in engineering. Due to the edge singularity, failure usually occurs from interface edge. For the evaluation of such failures, fracture mechanics approach is considered useful to avoid the edge singularity, by introducing an edge crack with various directions. However, this evaluation method is inconvenient for engineering application due to its complicity. In this paper, based on a huge amount of numerical analysis, an empirical formula of stress intensity factors (SIFs) for cracks initiated from the interface edge with various directions and crack length has been proposed. Since the cracks initiated from the interface edge is induced and dominated by the edge singular stress field, which can be characterized by the singular order and the corresponding stress intensity coefficient (SIC), this empirical formula relates their SIFs with the SIC and singular order of the edge singular stress field. With this empirical formula, it is possible to evaluate the fracture occurring from the interface edge by fracture mechanics approach, only with the numerical analysis of non-cracked bonded dissimilar materials.

Evaluation of Fatigue Strength of Butt Joint by Intensity of Singular Stress Field

2018 ◽  
Vol 940 ◽  
pp. 94-98
Author(s):  
Tatsujiro Miyazaki ◽  
Takeru Matsuda ◽  
Kaito Naka
Keyword(s):  
Fatigue Strength ◽  
Stress Field ◽  
Evaluation Method ◽  
Butt Joint ◽  
Fatigue Tests ◽  
Adhesively Bonded ◽  
Singular Stress ◽  
Rotating Bending Fatigue ◽  
Singular Stress Field ◽  
Adhesively Bonded Joint

In this study, the fatigue fracture criterion of the adhesively bonded joint is discussed. The singular stress field is formed at the interface end in the butt joint and causes the debonding fracture. The singular stress field is represented with the intensity of singular stress field (ISSF). The static debonding strength of the adhesively bonded joints is expressed with a constant value of critical ISSF. The rotating-bending fatigue tests are carried out on the butt joints of 15mm in diameter with four different adhesive thicknesses of 109 - 159μm, 209 - 265μm, 393 - 432μm and 754 - 841μm. The evaluation method by the ISSF is applied to the experimental results. It is found that the fatigue strength of the butt joint can be expressed with the constant value of critical ISSF.

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