A printed circuit board (PCB) is a standard component in many different electronic gadgets, such as computers, radars, beepers, etc. They are made from a variety of materials with laminate, composite and fiberglass the most common. Also, the type of circuit board can vary with the intended use. Let’s take a look at five of the different types:
Single sided – this is the most typical circuit board and is built with a single layer or base material. The single layer is coated with a conductive material like copper. They may also have a silk screen coat or a protective solder mask on top of the copper layer. A great advantage of this type of PCB is the low production cost and they are often used in mass-produced items.
Double sided – this is much like the single sided, but has the conductive material on both sides. There are many holes in the board to make it easy to attach metal parts from the top to bottom side. This type of circuit board increases operational flexibility and is a practical option to build the more dense circuit designs. This board is also relatively low-cost. However, it still isn’t a practical option for the most complex circuits and is unable to work with technology that reduces electromagnetic interference. They are typically used in amplifiers, power monitoring systems, and testing equipment.
Multi-layer – the multi-layer circuit board is built with extra layers of conductive materials. The high number of layers which can reach 30 or more means it is possible to create a circuit design with very high flexibility. The individual layers are separated by special insulating materials and substrate board. A great benefit of this type of board is the compact size, which helps to save space and weight in a relatively small product. Also, they are mostly used when it is necessary to use a high-speed circuit.
Flexible – this is a very versatile circuit board. It is not only designed with a flexible layer, but also available in the single, double, or multi-layer boards. They are a great option when it is necessary to save space and weight when building a particular device. Also, they are appreciated for high ductility and low mass. However, the flexible nature of the board can make them more difficult to use.
Rigid – the rigid circuit board is built with a solid, non-flexible material for its layers. They are typically compact in size and able to handle the complex circuit designs. Plus, the signal paths are easy to organize and the ability to maintain and repair is quite straightforward.
One of the most elementary tests that can be performed on a product is the tensile test to check the breaking resistance of a product. A test specimen is kept under tension to practice opposing forces acting upon opposite faces both located on the same axis that attempt to pull the specimen apart. These tests are simple to set and complete and reveal many characteristics of the products that are tested. These tests are measured to be fundamentally the reverse of a compression test.
Purpose of this test
Usually, this test is designed to run until the specimen breaks or fails under the specific load. The values that are calculated from this type of test can vary but are not limited to tensile strength, elongation, ultimate strength, modulus of electricity, yield strength, and strain hardening. The measurements taken during the test reveal the characteristics of a material while it is under a tensile load.
Tensile Testing for Plastics
Composites and Plastic are polymers with substances added to improve the performance or reduce costs. Plastic may be pressed or cast or extruded into sheet, film, or fibre reinforced plate, glass, tubes, fibre, bottles and boxes. Thermohardening or thermosetting plastics can be brittle or hard and temperature resistant. Thermosets include polyester resins, epoxy resins, polyurethane, phenolic resins, non-meltable, non-deformable and polyurethane. Polymers and plastics can be tested to measure product quality. The tests measure the weight required to split or break a plastic test material and sample elongation or stretch to that breaking load. The resulting data help to identify product quality and quality control checks for materials.
Plastic testing instruments, universal test machines provide a constant rate of extension because plastic tensile test behaviour is dependent on the speed of the test machine. The specimens loaded on the machines are set as per ASTM, DIN, ISO tensile test specimen dimensions. The Plastic tester machine should always rely on standard terms and conditions. As per ASTM D638, Plastic tensile test standards help to measure strain below 20 percent extension values. High strain can be measured by the machine, digital reader. Thin sheet sample testing is done as per the standard ASTM D882.
A high-quality testing machine is designed to measure the strength of a specific product, test method and product type. A good instrument can be the only solution required for your quality assurance and a worse choice can make you go in the loss too. So choose the instrument smartly.