Aerospace Manufacturing, Inc. uses a variety of tests to assess mechanical properties–performance and longevity of fasteners can only be determined through testing. Testing at multiple stages of the production process helps ensure that fasteners are made to the highest standards. Especially in the aerospace industry requires quality assurance.
Testing also helps identify any problems at the early stages of production, saving time and money in the long run. Tests typically include tensile, fatigue, and corrosion testing. Each of these tests serves a different purpose, and the results provide insight into the strength and durability of fasteners.
Hardness Tests – HRC, superficial, and microhardness
Hardness tests are essential in aerospace because hardness indicates a material’s ability to resist deformation. The HRC, superficial, and microhardness tests are the most common hardness tests. The HRC test measures the hardness of a material by measuring the depth of penetration of an indentor under a specified load.
The superficial test measures the hardness of a material’s surface by measuring the depth of penetration of an indentor under a specified load. The microhardness test is used to measure the hardness of a particular material layer by measuring the depth of penetration of an indentor under a specified load.
Metallography tests are used to study the microstructure of metals and alloys. The sample is first polished and then etched to reveal the features of interest. Metallography can identify the phases present in a sample, measure the grain size, and determine the distribution of impurities.
It is an essential tool for quality control in the aerospace industry, as it can help to identify defects in metal components. Metallography is also used to study the effects of heat treatment on metals. By understanding the microstructure of a metal, engineers can tailor the heat treatment process to achieve the desired properties.
Metallurgical (Structure) Analysis
Metallurgical (Structure) Analysis is a type of testing used to assess metals’ properties and microstructure. This testing can be used to determine the suitability of metals for use in aerospace components.
Metallurgical analysis can identify the presence of impurities, assess the mechanical properties of metals, and determine the microstructure of metals. This testing can be performed using various optical, scanning electron, and X-ray diffraction techniques.
Dimensional Inspection is a process used to check the dimensions of aerospace components. The test ensures that the part meets the tolerances specified in the drawing.
Dimensional Inspection is typically performed using a coordinate measuring machine (CMM). The CMM is used to take measurements of the component and compare them to the tolerances in the drawing.
Double Shear Tests
This test is done by applying force to two opposite sides of a material or component. The force is applied until the material or component breaks. This test is necessary because it helps determine the force a material or component can withstand before breaking.
Tensile Strength Tests
The test aims to determine the force required to break or deform a material. Tensile strength is a measure of a material’s resistance to being pulled apart and is an essential factor in determining the safety and durability of aerospace parts.
Tension Fatigue Tests
Tension fatigue testing is a NASM 1312-11 standard that determines a material’s resistance to fracture under constant amplitude cyclic loading conditions. This type of testing is commonly used for bolts, screws, and nuts.
The test specimen is subject to a range of applied loads, from below the yield strength to the material’s ultimate force.
The number of cycles applied varies depending on the material being tested but can be in the millions. The results of tension-fatigue testing allow engineers to design products resistant to failure due to repeated loading.
Stress Durability Tests
Stress durability testing is a NASM 1312-5 standard for all externally threaded fasteners, which may be subject to embrittlement. The test is not limited by configuration or size, making it ideal for various applications. NASM 1312-5 addresses static and fatigue strength requirements and minimum mechanical property values.
This fastener testing is conducted by placing it in an installation position and subjecting it to a series of stress loads. The loads are applied in tension and shear, and the fastener is evaluated for deformation, cracking, or other damage. This test ensures that fasteners can withstand the stresses of being used in an installed environment.
Stress Rupture Tests
The test is used to evaluate the strength of materials under conditions of constant stress. This is important because it allows engineers to determine the limits of material performance and optimize designs accordingly. Stress rupture testing is typically conducted on small material samples, and the results are then extrapolated to larger components. The test involves subjecting a sample to a constant load until it fails.
Non-Destructing Testing (NDT) Level II and Level III in-house certified (MT, PT)
Non-Destructing Testing (NDT) is a process where components are examined for flaws without causing any damage to the material. It is used in various industries, including aerospace, to ensure that products meet safety and quality standards. NDT Level II and Level III in-house certified (MT, PT) are two of the most common methods of NDT testing. MT uses magnetic fields to detect flaws, while PT uses capillary action.
Hydrogen Embrittlement Tests
NASM 1312-5 is a standard for testing the effects of hydrogen embrittlement on steel fasteners. The hydrogen embrittlement problem is often delayed, which may occur in service. Steels that have higher strength are more affected by hydrogen embrittlement than lower-strength steels.
The problem can be controlled by carefully selecting the proper plating procedure, plating formulation, and sufficient baking to drive out residual hydrogen.
The test involves exposing the metal to a hydrogen gas atmosphere and then measuring the amount of hydrogen absorbed by the metal. The test can determine the metal’s susceptibility to hydrogen embrittlement and identify corrosion-resistant materials.
Testing at Aerospace Manufacturing, Inc.
Aerospace Manufacturing, Inc has a team of experienced and expert staff to perform all the above tests. We have a full range of testing equipment and instrumentation to ensure that we can provide accurate test results for our customers.