Evaluation of Single-Lap and Block Shear Test Methods in Adhesively Bonded Composite Joints
| Autor: | Tim A. Osswald, Alec Redmann, Vinay Damodaran, Pavana Prabhakar, Felix Tischer |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
adhesive
shear testing Materials science Adhesive bonding joining Composite number single lap shear 02 engineering and technology lcsh:Technology bonding Stress (mechanics) 0203 mechanical engineering Composite material lcsh:Science Engineering (miscellaneous) Joint (geology) lcsh:T Delamination 021001 nanoscience & nanotechnology Shear (sheet metal) 020303 mechanical engineering & transports Ceramics and Composites lcsh:Q Adhesive Direct shear test 0210 nano-technology block shear |
| Zdroj: | Journal of Composites Science Volume 5 Issue 1 Journal of Composites Science, Vol 5, Iss 27, p 27 (2021) |
| ISSN: | 2504-477X |
| DOI: | 10.3390/jcs5010027 |
| Popis: | Adhesive bonding is increasingly being used for composite structures, especially in aerospace and automotive industries. One common joint configuration used to test adhesive strength is the single-lap shear joint, which has been widely studied and shown to produce significant normal (peeling) stresses. When bonding composite structures, the normal stresses are capable of causing delamination before the adhesive bond fails, providing inconclusive engineering data regarding the bonding strength. An alternative test is the block shear joint, which uses a shorter sample geometry and a compressive-shear loading to reduce normal stresses. Analytical models proposed by Goland and Reissner and Hart-Smith are used to compare the edge-bending moment for the two joint configurations. The stress distributions along the bondline are also compared using finite element analysis. Experimental tests are conducted to evaluate these analyses and the failure modes of each configuration are recorded. Block shear samples demonstrate a joint strength over 100% higher than single-lap shear specimen bonded with the same adhesive material. The lower joint strength measured in single-lap shear is found to be potentially misleading due to delamination of the composite adherend. |
| Databáze: | OpenAIRE |
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