Manufacture of Quality Specimens

Development of a Unified Specimen for Adhesive Characterisation—Part 1: Numerical Study on the Mode I (mDCB) and II (ELS) Fracture Components

“…Tensile properties are commonly determined through bulk tensile tests and butt joints [2]. The ASTM D 897 and ASTM D 2095 standards describe directives related to the practical aspects and methodology of preparing and testing to perform this type of test.…”

“…The ASTM D 897 and ASTM D 2095 standards describe directives related to the practical aspects and methodology of preparing and testing to perform this type of test. The first one uses short circular specimens made of metal or wood, and the second is more general and includes round and square geometries [2].…”

“…For shear properties, the thick adherend shear test (TAST) appears as a common choice, since it relies on an easily produced specimen and a simple testing setup [2]. It also emerges as a valid substitute for the conventional single lap shear (SLS) joint, which although simple to execute is beset with complex stress states and, therefore, is not suitable for characterisation of the strength properties of adhesives.…”

“…In order to acquire accurate experimental results, a modified TAST fixture was created by Cognard et al [3], although it is still not standardised. It provides a stiffer apparatus combined with a more compact specimen, resulting in a more uniform adhesive stress condition in the joint and severe restriction of edge effects [2].…”

Evaluation of the effects of defects and ageing on the strength of composite bonded joints by mechanical tests and numerical simulation

“…However, the bulk adhesive specimens are not as thin as the adhesive layer present in real joints. Additionally, the curing process of the bulk adhesive may not be identical from the one used in a joint (da Silva et. al., 2012).…”