Modeling progressive failure of bonded joints using a single joint finite element
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This item is printed on demand. Original publisher: Cleveland, Ohio : National Aeronautics and Space Administration, Glenn Research Center, 2010 OCLC Number: (OCoLC)729722290 Excerpt: . . . b a t x a ) l Beam Elements Joint Element b ) Figure 8. - A typical DCB specimen, ( a ) the geometric parameters and boundary conditions for the DCB specimens and ( b ) the mesh for the joint element DCB model. 2Ea EaG Ic E a Stress GCI Strain Figure 9. - The stress strain relation of the adhesive was defined based on the mode one energy release rate and modulus. TABLE 1. - MATERIAL PROPERTIES AND GEOMETRIC PARAMETERS FOR SONG AND WAAS ( REF. 15 ) DCB SPECIMENS Specimen Adhesive Adherend Geometric Parameters E G E l a b t a Ic ( GPa ) ( N m ) ( GPa ) ( mm ) ( mm ) ( mm ) ( mm ) ( m ) E7T1 G40 4. 1 335 116 200 52. 6 15. 5 4. 65 35 E719 IM7 3. 3 1130 135 200 35. 5 15. 1 3. 23 6 that their FEA took 1 to 2 hr to run each load loop, while the present analysis took only 30 to 60 s per load loop, a speed increase of a factor of 120. This demonstrates the usefulness of the joint finite element in performing quick, computationally-efficient analysis of joints, even in progressive failure scenarios. The plots in Figure 11 are helpful in visualizing how the stress and strain evolve in the adhesive with increasing end displacement. Figure 11 ( a ) shows the load displacement plot for the E719 IM7 DCB specimen. The circles show points during loading at which stress ( Fig. 11 ( b ) ) and strain ( Fig. 11 ( c ) ) snapshots were taken. The solid circles correspond to solid lines on the stress and strain plots, while the hollow circles correspond to the dotted lines on the plots. The stress in the adhesive rises at the left end of the adhesive until the maximum stress according to the stress strain relation ( Fig. 9 ) is reached, at which point the stress at the end of the adhesive reduces to zero. At this point, the adhesive starts to fail. The strain reaches a critical lev. . . This item ships from La Vergne,TN.

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U.S. Government, Gustav Hugo, Paperback, English-language edition, Pub by General Books LLC.