The ASTM D5656-10 standard published by the American Society for Testing and Materials (ASTM) describes the requirements for the preparation of thick-adhesive lap shear specimens and defines a test method for determining the stress-strain behavior of adhesives. This test method includes data reduction and analysis of stress-strain curves obtained using thick-adhesive lap shear specimens.
During testing, a tensile load is applied to thick-adhering lap shear specimens and the adhesive is placed in the shear. Shear stress-strain properties of the adhesive are obtained. This test method is designed to characterize adhesive properties and is useful for the design and analysis of adhesively bonded joints.
A universal testing machine that maintains a load speed of 2455 N/min is used to perform this test. The breaking load of the samples should be between 15 and 85 percent of the full scale capacity of the machine. Handles used must be self-aligning and two specially designed extensometers must be able to measure displacements in the adhesive bond overlap area.
Adhesive bonded joints are widely used for composite materials as an alternative to traditional mechanical joint designs. In a bonded joint, the load is transferred from one substrate to another mainly through adhesive shear stress. One of the major disadvantages of predicting the mechanical behavior of bonded joints is the lack of reliable data on the mechanical properties of adhesives. Among the many test methods developed for testing structural adhesives in thin-film geometries, the thick-adhesive overlay shear test described in ASTM D5656-10 is frequently used to determine the shear properties of adhesives while specimens are loaded under tension. However, due to the non-uniformity of the adhesive shear stress distribution in the joint through both the bonded line thickness and the overlap length and the measurement method described in the test method, some errors occur if corrections are not made.
Our company, among the numerous test, measurement, analysis and evaluation studies it has given for businesses in various sectors, with its trained and expert staff and advanced technological equipment, within the scope of ASTM D5656-10 standard, to determine the stress-strain behavior of adhesives in stress loading and shearing. It also provides standard testing services for lap shear joints.
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