GMA uses ZwickRoell to determine mechanical material properties in Hot Tensile Tests

GMA (Gesellschaft für Materialabnahme) has been specializing in material testing and quality assurance for over thirty years. As a certified testing service provider with EN ISO/IC 17025 accreditation, the company serves a wide range of industries including aerospace, pipeline and power station construction, oil and gas, automotive and wind energy. GMA is part of Mistras Group Inc. (Princeton, USA) and offers a comprehensive services portfolio for traditional and advanced destructive and non-destructive material testing, specimen manufacture, industrial surveying and damage analysis.

The company's 2,750 square meter testing facility in Essen, Germany is specialized at damage analysis and destructive material testing. The tests cover both metals and composites / fiber composites (CFRP or GRP). No matter if it is about the toughness of a paper clip or more complex properties of materials used in the aerospace industry - GMA subjects anything and everything to detailed scrutiny. The Essen-based experts assist also in optimizing material selection including development and production.

GMA’s Essen site is equipped with state-of-the-art testing machines for determining material characteristic values relevant to the design and safety of components, whether through Charpy impact tests, tensile tests or others. In accordance to the customers' specification, GMA can provide most reliable findings to such key material properties as hardness, stiffness and strength.


An advanced testing method applied only for metallic materials is the Hot Tensile Test. To be able to perform this particular tests according to ISO 6892-2 and ASTM E21, GMA has equipped its Essen site with a ZwickRoell Z100 TEW AllroundLine testing machine. This high-temperature round furnace has been placed in the fully air-conditioned testing laboratory where it is used to determine the mechanical material properties of metals at elevated temperatures. The tested materials are destined for use in various areas, including the aerospace and automotive industries. Although tests with temperatures between 800°C and 900°C are the most typical applications, the entire testing capability of the furnace ranges from 200°C to 1200°C.
"AllroundLine allows GMA to resolve demanding testing situations and satisfy the most challenging requirements. The long test strokes, large test speed ranges and interchangeable load cells as well as test fixtures, make the Z100 the ideal material testing machine to enable GMA to achieve reliable, dependable test results," states site manager Petra Freyer. "The Z100 allows testing of specimens and components with widely differing shapes and dimensions, made of various materials and material combinations and with correspondingly differing properties."
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