Graphite-Phenolic Resin Bond Shear Strength Testing
The aim of this experiment was to determine the shear strength of graphite-phenolic resin bond. The bond was first exposed to a water-soluble adhesive containing epoxy and amine curing agents, and then to an epoxy-modified phenolic resin, which builds the cured bond. A universal testing machine was used to measure the shear stress at break point of the specimen.
Graphite-phenolic resin bond is an important industrial material that can be used to form a durable and dimensionally stable bond between materials with a variety of different surface characteristics. The bond is especially useful in applications where durability needs to be high and when a wide range of temperatures or chemical environments are present. In order to ensure the desired strength and dimensional stability, the bond must be tested for shear strength.
Testing begins with the preparation of the bonded specimens and the epoxy curing agent. The bonded samples are cut from a sheet of graphite-phenolic resin with a cutting tool. A specimen/curing agent mixture is then prepared by mixing the curing agent with a solvent and a substrate bonding material, such as epoxy. The epoxy-modified phenolic resin is then applied to the specimens. Once applied, the resin is cured in a curing oven at approximately 150°C for two hours. The cured samples are then cooled to room temperature.
The universal testing machine is set up to measure the shear strength of the specimen. To achieve this, the testing machine is loaded with the specimen on the base and the upper jaws are aligned. The specimen is then placed in between the adjustable upper and lower jaws and the variable load is applied. As the variable load increases, the shear strength is monitored with a digital readout. Once the desired load is reached and the specimen fails, the shear strength of the bond is calculated. The shear strength is calculated by dividing the maximum load applied to the specimen by the cross-sectional area of the specimen.
The data obtained from the universal testing machine is then analyzed to determine the shear strength. The data is plotted as a graph, which shows the shear strength of the bond as a function of load. The highest point of the graph is the break point, which indicates the maximum shear strength of the bond. The data can also be used to compare the shear strength of different types of bonds or between different bonding agents.
In conclusion, this experiment successfully determined the shear strength of a graphite-phenolic resin bond. The use of a universal testing machine to measure the shear stress of the specimen made it possible to accurately calculate the shear strength of the bond and compare it to other bonding agents. The results of this experiment demonstrate that graphite-phenolic resin bond is a reliable and durable option for forming a durable and dimensionally stable bond between different surface materials.
