One of the principal characteristics that defines a material’s mechanical behavior is tensile strength. It is quantified as how much strain a material can take before it fails, and determines the resistance of a product to axial tension, or pulling forces.
This parameter affects a number of other material properties including yield strength, ultimate tensile strength, and Young’s modulus. However, tensile strength may vary in finished products due to pressure variations or fluctuating temperatures.
Laboratory ovens are often used as part of a high temperature tensile testing setup. This provides valuable insight into how a material behaves at higher temperatures and its resistance to thermodynamic stress, and is more reflective of the end-product conditions.
This type of testing is performed on aluminum turbine blades, to ensure the material is strong enough both at rest and during extended periods of operation when the component experiences intense heat, inflicting a high thermal strain gradient.
This article will explore in more detail about how laboratory ovens are used for advanced tensile testing:
Thermcraft Laboratory Ovens for Materials Testing
LAB-TEMPTM laboratory ovens are used worldwide for advanced materials testing. This is due to their advanced heat treatment chambers which allow precise quantitation of how resistant a material is to thermal stress. The LAB-TEMP range is extremely versatile and can be customized with additional measuring instrumentation, or equipment to put the sample material under mechanical stress for testing.
Thermcraft’s materials testing range of laboratory ovens consists of three individual product series: LBO; LSL; and LSP. These systems cover the thermal processing range up to 1700 °C (3092 °F) and can be built to customer specifications with accommodations for additional test machines.
Depending on the laboratory oven capabilities, hot tensile testing can be undertaken through contact or non-contact methods. A split tube furnace can be fitted with custom mounting brackets and a pull rod that plugs one or both ends of the heating compartment to accommodate an external extensometer.
Thermocouples in the control zone monitor the heating compartment to determine accurate thermal values from within the test chamber as opposed to the temperature of the ceramic heating elements. Once the sample has reached the predetermined temperature, axial strain is applied by the pull rod and the extensometer can detect stress values in response to these bespoke thermodynamic conditions.
In both the LBO box oven and high-temperature split tube furnaces, these experiment parameters can be altered to suit bespoke furnaces
Applications of Hot Tensile Testing
Typically, hot tensile testing is used to characterize materials that will experience extreme thermodynamic conditions. This includes components for internal combustion engines, blades for energy-generating turbines, and materials for aerospace engineering. Hot tensile testing is a key technique in designing these materials to ensure maximum service longevity under extreme temperatures and tensile stress.
Laboratory Ovens from Thermcraft
Thermcraft has been manufacturing laboratory ovens for almost 50 years and is a market-leader in their production and supply for novel applications. Their LAB-TEMPTM range of products has been used by researchers, in both standard and bespoke configurations, to perform an array of material characterization techniques, including tensile, creep, fatigue, compression and durability testing.
This information has been sourced, reviewed and adapted from materials provided by Thermcraft, Inc.
For more information on this source, please visit Thermcraft, Inc.