What is ASTM D1002?
What is ASTM D1002?
ASTM D1002 describes the procedure for evaluating the shear strength of adhesives used for bonding metals. Adhesive testing is critical for understanding the relative strength of different materials, as well as identifying the effects of environmental conditions and aging on the strength and durability of a bond.
What is a lap shear test?
Lap shear strength testing measures the ability of a material to withstand stresses set in a plane, where the exerted shear force is moving the two substrates in opposite directions. It is one of the most common stresses that a bonded joint can face during service, especially in structural bonding applications.
How do you perform a lap shear test?
Test Procedure:
- Measure the amount of shear area in square inches or square centimeters.
- Load each end of the specimen in the tensile grips.
- Apply a force at a controlled rate to the specimen until it breaks and record the maximum force and type of joint failure.
What is ASTM D903?
ASTM D903 is a common tensile test used to evaluate the peel or stripping characteristics of adhesively bonded materials used in a wide variety of applications in an even wider range of industries. Some examples of materials tested to ASTM D903 are plastic films, adhesive labels, and waterproofing materials.
What is meant by the term shear force when applied to materials used in vehicle manufacture and construction?
A force acting in a direction parallel to a surface or to a planar cross section of a body, as for example the pressure of air along the front of an airplane wing. Shear forces often result in shear strain. Resistance to such forces in a fluid is linked to its viscosity. Also called shearing force.
What is Lap strength?
Lap shear strength is the ability of an adhesive to resist forces in the plane of the bonded surfaces. Bonded structural joints are typically designed so that the adhesive is only subjected to in-plane forces, resulting in shear stress in the adhesive.
What is single-lap joint?
Single-lap joints are a widely-used and relatively strong and simple way joining two materials via an overlapping bond. With the growing use of composite materials in modern design practices, the need to join increasingly dissimilar materials has arisen.
How do you test paint for adhesion?
The test is done by securing loading fixtures (dollies) perpendicular to the surface of a coating with an adhesive. Then the testing apparatus is attached to the loading fixture and is then aligned to apply tension perpendicular to the test surface.
How do you test adhesive strength?
To measure adhesion, tape is applied to a stainless steel panel. The tape is then removed. The force required to remove (or peel) the tape determines its adhesion level. The force is measured in ounces per one inch of tape.
What are the different between tensile forces and compressive forces?
Tensile and compressive stresses are two types of stresses a material can undergo. The type of the stress is determined by the force being applied on the material. The main difference between tensile and compressive stress is that tensile stress results in elongation whereas compressive stress results in shortening.
Which material is strongest in resisting the force known as compression?
Concrete and ceramics typically have much higher compressive strengths than tensile strengths. Composite materials, such as glass fiber epoxy matrix composite, tend to have higher tensile strengths than compressive strengths.
What is tensile adhesion strength?
Adhesive strength refers to the ability of an adhesive to stick to a surface and bond two surfaces together. It is measured by assessing the maximum tensile stress needed to detach or unstick the adhesive perpendicular to the substrate.
