Geometry and dimensions of double-lap joint.

Contexts in source publication

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... stress analysis for DLJ and SLJ under mechanical load as well as thermo-mechanical loads wasdone by using the commercial finite element method (FEM) package ANSYS 19.2 (employing APDL codes).The geometry and dimensions for DLJ and SLJ are shown in Figure 1 and Figure 2 respectively. The 3D model used in this investigation has the following dimensions: adhesive thickness ; overlap length/adhesive thickness ratio ; total length/adhesive thickness ratio ; adherend/adhesive thickness ratio ; and width/adhesive thickness ratio . ...

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... the geometrical parameters were normalized with respect to the adhesive thickness thus results are valid for wide range of joints with different dimensions. In case when only mechanical load is applied on DLJ the load (as an average stress ) was applied at the end of the inner plate (at see Figure 1) along the length of the joint, whiledisplacements along the width and thickness ( ) were fixed. Moreover, the symmetry boundary condition was applied on the opposite end of the outer plate (at ) as well as on the top surface of the inner plate (at ). ...

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... the symmetry boundary condition was applied on the opposite end of the outer plate (at ) as well as on the top surface of the inner plate (at ). Thus, only one-quarter of the whole model (see Figure 1) is used for the simulation, which results in fewer elements and shorter solution time. But in case of SLJ the symmetry boundary conditions are removed and fully clamped boundary condition is applied at one end (at ) with average stress ( ) applied at the opposite end at (see Figure 2). ...

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... the first part,the same thickness for both adherends was used ( ⁄ and ⁄ ) as shown in Figure9. In the second part, one of the adherend was kept the same but the other was changed as shown in Figure 10 and Figure 11. In order to prevent change of the force as the cross-section area was changed, the force (120 N) was applied instead of average stress. ...

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... the first part,the same thickness for both adherends was used ( ⁄ and ⁄ ) as shown in Figure9. In the second part, one of the adherend was kept the same but the other was changed as shown in Figure 10 and Figure 11. In order to prevent change of the force as the cross-section area was changed, the force (120 N) was applied instead of average stress. ...

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... in case of SLJ the peel stress concentration and stress perturbation zone are increased with increasing the adherend thickness, moreover, the shear stress concentration is reduced with increase of the adherend thickness; the plateau level is also reduced and the length of the plateau becomes shorter. In case of the DLJ increasing the thickness of one adherend plate while keeping the second adherend plate constant show the following results: thickness increase of outer or inner plate causes reduction of the stress concentration at the end of the overlap, with more significant effect when increasing the inner plate thickness two times (see Figure 10 and Figure 11). But in case of SLJ, the peel stress concentration increased at the overlapping end which is next to the corner of the thicker plate and reduced on the other end. ...

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... in case of SLJ the peel stress concentration and stress perturbation zone are increased with increasing the adherend thickness, moreover, the shear stress concentration is reduced with increase of the adherend thickness; the plateau level is also reduced and the length of the plateau becomes shorter. In case of the DLJ increasing the thickness of one adherend plate while keeping the second adherend plate constant show the following results: thickness increase of outer or inner plate causes reduction of the stress concentration at the end of the overlap, with more significant effect when increasing the inner plate thickness two times (see Figure 10 and Figure 11). But in case of SLJ, the peel stress concentration increased at the overlapping end which is next to the corner of the thicker plate and reduced on the other end. ...

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... was done in the same way as described section 3.1. The maximum and minimum peel and shear stresses are observed for DLJ with 90-layer and 0-layer respectively as can be seen in Figure 14. These results also show that the peel and shear stress concentration at the overlap ends are shifted down with approximately the same value in both cases, SLJ or DLJ (the comparison wasdone between Figure 7 and Figure 14). ...

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... maximum and minimum peel and shear stresses are observed for DLJ with 90-layer and 0-layer respectively as can be seen in Figure 14. These results also show that the peel and shear stress concentration at the overlap ends are shifted down with approximately the same value in both cases, SLJ or DLJ (the comparison wasdone between Figure 7 and Figure 14). In case ifthermal stresses weretaken into account, the peel stress concentration is reduced as follows (the relative difference in stress values between simulations with and without thermal stresses is presented): 1) in case of SLJ with CF-QI-90 by ⁓90%, CF-UD-0 by 65%, CF-QI-0 by ⁓60%, CF-UD-90 by 40%; 2) in case of DLJ with CF-QI-90 by ⁓90%, CF-UD-0 by 80%, CF-QI-0 by ⁓55%, CF-UD-90 by 25%. ...

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... parameters are adherend bending stiffness for maximum peel stress and adherend axial modulus for maximum shear stress.The adherend bending stiffness which is given in Table 2,is presented versus the maximum peel stress in Figure16a. Figure 16 shows that the maximum peel stress value reduces with increasing the bending stiffness of the adherend. This finding is satisfied for SLJ at both ends as demonstrated in [22]. ...

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... for DLJ it is valid at the end which is next to the inner plate corner but the stress at the second end which is next to the outer plate corner dependents on the axial modulus of adherend. The curing in one-step and two-step have the same effect on the stress level (the trend is the same as can be seen in Figure 16a), but with lower maximum peel stress value when the joint was manufactured in one-step. The DLJ curves mirror SLJ curves with higher shift between one-step and two-step curves. ...

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... DLJ curves mirror SLJ curves with higher shift between one-step and two-step curves. The maximum shear stress is presented vs the adherend axial modulus (given in Table 2) in Figure 16b. The maximum shear stress is reduced with increasing adherend axial modulus, but the behaviour is slightly different between the DLJ and SLJ. Figure 16. ...

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... maximum shear stress is reduced with increasing adherend axial modulus, but the behaviour is slightly different between the DLJ and SLJ. Figure 16. Maximum peel (a) and shear (b) stress under thermos-mechanical load in the adhesive with respect to bending stiffness and axial modulus respectively for DLJ and SLJ. ...