An Investigation of Interface Bonding Strength of Bimetal Plate Based on the Optimization of Asymmetric Double Cantilever Beam Model

doi:10.11900/0412.1961.2020.00114

Acta Metall Sin

2020, Vol. 56

Issue (12): 1617-1628 DOI: 10.11900/0412.1961.2020.00114

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An Investigation of Interface Bonding Strength of Bimetal Plate Based on the Optimization of Asymmetric Double Cantilever Beam Model

QIN Qin¹^,²(

), LI Cheng², HE Liu¹, YE Chenlong², ZANG Yong¹

1 School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China
2 Shunde Graduate School, University of Science and Technology Beijing, Foshan 520300, China

Cite this article:

QIN Qin, LI Cheng, HE Liu, YE Chenlong, ZANG Yong. An Investigation of Interface Bonding Strength of Bimetal Plate Based on the Optimization of Asymmetric Double Cantilever Beam Model. Acta Metall Sin, 2020, 56(12): 1617-1628.

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Abstract

The bimetal sheet products obtained by the incremental forming are gradually gaining popularity because of their excellent properties. The forming process of the bimetal sheets is more complicated than that of the single metal sheet because it involves a complex interface between the two metal sheets. The bonding strength of the interface is an important parameter for evaluating the bonding properties of a bimetal sheet. However, if the required bonding strength is higher than the strength of the substrate, appropriate strength is difficult to achieve using only experimental methods. An improved analytical method to calculate the interface bonding strength has been proposed based on the widely used interface model of an asymmetric double cantilever beam. This improved analytical method considers the plasticity of the interface. The interface bonding strength of the explosively welded T2/A1050 copper-aluminum bimetal sheet has been assessed using the improved method, and its interface bonding strength has been found to reach 208 MPa. This bonding strength has been used in a finite element model for the forming process of the bimetal sheet. The correctness of the method has been verified by comparing the analytical results with the experimental data. Furthermore, the influence of interface bonding strength on the maximum forming depth has been explored, and it has been found that the maximum forming depth increased by 210% when the interface bonding strength increased by 38%. Moreover, a three-dimensional model including a tool, the Cu-Al bimetal sheet, and a cohesive element between the two metal sheets has been suggested for investigating the bulge defect of the forming part. The bonding strength of the interface obtained above has again been utilized in the finite element analysis. The impacts of different reductions and tool diameters on the bulge defect of the forming part have systematically been discussed. The results show that bulge defect decreased by 57% when the reduction decreased from 2.0 mm to 0.5 mm, and the bulge defect decreased by 38% when the tool diameter increased from 10 mm to 22 mm. Optimized parameters have been suggested to effectively reduce the bulge defect by 53%.

Key words: bimetal plate interface model theoretical analysis interface bonding strength

Received: 10 April 2020

ZTFLH:

TH140.1

Fund: Basic and Applied Basic Research Fund for Guangdong Province(2019B1515120070);Special Funds for Science and Technology Innovation of Shunde Graduate School of University of Science and Technology Beijing(BK-19BE009)

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	Qin QIN
	Cheng LI
	Liu HE
	Chenlong YE
	Yong ZANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2020.00114 OR https://www.ams.org.cn/EN/Y2020/V56/I12/1617

Fig.1 Bilinear elastoplastic interface constitutive model based on linear hardening assumption in tensile direction (a) and shear direction (b) (σ—stress in the tensile direction of the interface, σ_s—yield stress in the tensile direction of the interface, Δw₀—deformation of the interface under the tensile yield state, Δw—deformation of the interface in the tensile direction, K_z—elastic stiffness coefficient in the tensile direction, K $z'$ —tangent stiffness coefficient in the tensile direction, τ—stress in the shear direction of the interface, τ_s—yield stress in the shear direction of the interface, Δu₀—deformation of the interface under the shear yield state, Δu—deformation of the interface in the shear direction, K_x—elastic stiffness coefficient in the shear direction, K $x'$ —tangent stiffness coefficient in the shear direction)

Fig.2 Technical roadmap

Fig.3 Simulation model of double cantilever beam (a—length of initial layer crack, b—length of the connecting part of the model, P—end load of the model)

Fig.4 Bilinear traction-separation response of the cohesive element relation of Fvss (F—interface bonding strength, K—stiffness, G—breaking energy, s_c—interface displacement at maximum crack tension, s_e—interface displacement at material failure, s—displacement of interfacial crack propagation)

Table 1 Physical property parameters of Cu-Al bimetal plates of A1050 and T2^[30]

Table 2 End displacements of double cantilever beam model at different interface bonding strengths

Fig.5 Comparisons of simulation results of T-peeling model before (a) and after (b) deformation

Table 3 Partial calculated results of breaking energies (G) vsδ₁ and δ₂ when stretching in elastic stage and shearing in plastic stage

Fig.6 The simulation of single point incremental forming (A1050—aluminum layer of bimetal plates, interface—interface layer of bimetal plates, T2—copper layer of bimetal plates, tool—tool head of the single point incremental forming)

Fig.7 The damage of the cohesive element (QUADSCRT represents secondary stress criterion)

Fig.8 Simulated result of the bimetal sheet damage

Fig.9 Comparisons between the result of single point incremental forming

Fig.10 Experimental and simulated contour curves of single point incremental forming

Fig.11 Sectional profiles of conical parts under different reductions (a) and the heights of bulge defect under different reductions (b)

Fig.12 Sectional profile curves of forming depth vs displacement of conical parts under different tool diameters (D) (a) and histogram of height of bulge defect vs tool diameter (b)

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