Table of Contents
What is proof load test?
A proof load test is performed on different lifting and rigging components to ensure they can withstand the design load without failure or unacceptable deformation. (yielding).
What is proof load of chain?
A proof load test is a process that requires the lift of a specific type of material (the rope or chain) using specially designed proof load test machines. With the lift, the system is able to measure the tensile strength and load capacity of the material based on elongation under force.
What is the purpose of a proof load test?
Proof load testing is designed to ensure that items of lifting equipment can perform to the required standard in accordance with manufacturer’s guidance, by giving it a full strength test. Proof load tests are often needed in addition to the statutory requirements, e.g. LOLER regulations.
What is proof load capacity?
The Proof Test Load (usually twice the Working Load Limit) is the load which the product withstood without deformation when new and under laboratory test conditions. A constantly increasing force is applied in direct line to the product at a uniform rate of speed on a standard pull testing machine.
What is minimum proof strength?
11.4. The minimum yield strength is defined as the tensile stress required to produce a total elongation of 0.5%.
What is a proof round?
A “proof round” is an ammunition assembly designed to be used in proof testing; this can use a fixed cartridge, a semi-fixed cartridge, or separately loaded projectile, charge and primer. A “proof shot” is a special projectile used in a proof round or other projectile weapons, electromagnetic guns for example.
What is proof stress formula?
The proof stress is measured by drawing a line parallel to the elastic portion of the stress/strain curve at a specified strain, this strain being a percentage of the original gauge length, hence 0.2% proof, 1% proof (see Fig. 5).
What is a proof test used for in welding?
In its simplest form, load testing involves applying a load to a structure or piece of equipment. A proof test is a type of load test that demonstrates the fitness of a load-bearing structure.
What is proof load test for bolts?
In a proof load test, a headed bolt is placed in a testing machine with a nut on the threaded end, and a wedge under the head. The wedge varies from 4-10 degrees depending on the size and configuration of fastener, and serves to evaluate the ductility of the bolt.
What is proof stress?
The proof stress of a material is defined as the amount of stress it can endure until it undergoes a relatively small amount of plastic deformation. Specifically, proof stress is the point at which the material exhibits 0.2% of plastic deformation.