Identification of cohesive zone model parameters based on interface layer displacement field of bonded joints

Bondline thickness effect on fracture behaviors and cohesive zone model (CZM) is an important topic for adhesive joints. In this paper, the fracture and CZM of sintered nano silver adhesive joints are investigated based on end notched flexure (ENF) test. Results show that load versus displacement curves of sintered silver adhesive joints is sensitive to the bondline thickness. With compliance‐based beam method (CBBM), the shearing fracture toughness of sintered silver bonded joints heightens with the increase of bondline thickness, which indicates that shearing fracture toughness is highly dependent on bondline thickness. R curves increase steeply for short equivalent crack length and become plateau for long equivalent crack length. The cracking morphology shows that the cracking paths are mainly interfacial and interlayer types. The bilinear CZM is also presented. The bondline thickness effect on CZM parameter is presented and discussed. The CZM given in this paper can be adopted for reliability analysis in power devices.

Section: Discussionmentioning

confidence: 99%

Bondline thickness effect on fracture and cohesive zone model of sintered nano silver adhesive joints under end notched flexure tests

Dai

Zan

et al. 2023

“…Tauheed and Datla 11 proposed a framework for determining the parameters of the mode‐I TSL of an adhesive joint using a direct method by studying mode‐I fracture of DCB specimens made with carbon fiber‐reinforced polymer (CFRP). Cricrì et al 12 used the experimental and numerical relative adherend slip displacements as the comparison parameter to determine the CZM parameters and compared them with other approaches in the literature.…”

Section: Introductionmentioning

confidence: 99%

An equivalent cohesive zone model for a wide range of ductile and brittle adhesives

Noruzi,

Khoramishad

2023

This paper aims to propose an equivalent trapezoidal traction–separation law (ET‐TSL) of the cohesive zone model applicable to a wide range of ductile and brittle adhesives using equivalent and fictitious material concepts. The ET‐TSL can reduce the analysis time and cost of complex problems without degrading the prediction accuracy. To experimentally validate the proposed ET‐TSL, double‐cantilever beam (DCB) samples were fabricated with glass fiber‐reinforced polymer substrates and a highly ductile adhesive and then tested. The fracture behavior of the specimens was modeled using the proposed ET‐TSL. Moreover, the accuracy and comprehensiveness of the proposed model were verified by employing the proposed ET‐TSL for different adhesive joints made of different adhesives ranging from brittle to ductile adhesives and different substrates found in the literature. It was found that the proposed ET‐TSL can provide reasonable accuracy in simulating the fracture response of different types of adhesive joints with brittle and ductile adhesives.

“…CZMs are incorporated into the numerical techniques using the cohesive elements characterized by cohesive or traction–separation laws (TSL). Particularly, CZMs are of special interest for many researchers in adhesive bonded joints because of their ability to anticipate the failure behavior of both brittle and toughened adhesives, as well as thick and thin adhesive layers 36–39 …”

Section: Introductionmentioning

confidence: 99%

“…Particularly, CZMs are of special interest for many researchers in adhesive bonded joints because of their ability to anticipate the failure behavior of both brittle and toughened adhesives, as well as thick and thin adhesive layers. [36][37][38][39] Belytschko et al 40 analyzed the dynamic fracture in concrete using the CZMs through the EFG framework and proposed that the EFG method is reliable for this task. Klein et al 41 used reproducing kernel particle method (RKPM) and compared several cohesive approaches of that time (bulk and surface cohesive formulations).…”

Section: Introductionmentioning

confidence: 99%

Generalized displacement control technique for mode I/II fracture problems using cohesive zone model within a modified element‐free Galerkin framework

Kumar

Muthu

2023

A modified element‐free Galerkin (EFG) method that combines the Heaviside enrichment and diffraction method is used to study crack propagation problems by employing a cohesive zone model (CZM) with an exponential traction separation law (TSL). The generalized displacement control method (GDCM) is adopted to solve the nonlinearity arising during the damage evolution. The proposed methodology is applied to (1) uncracked three‐point bending (TPB) and (2) adhesively bonded: (a) cracked double cantilever beam (DCB), and (b) end‐notched flexure (ENF) problems. In the passing, a simple 1D study is considered to demonstrate the advantage of level‐set enrichment coupled with CZM. Several parametric studies have been carried out on the EFG method and GDCM (reference and incremental load parameter). The results obtained by the proposed methodology agree well with the experimental/reference results. Specific advantages of GDCM on computational time, number of iterations, and ability to capture snapback vis‐à‐vis the popular Newton–Raphson technique are presented.