12/16/24, 11:19 AM
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`What is Stress Relaxation of Materials?
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` JULY 27, 2023
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`Understanding stress relaxation is essential for ensuring the long-term integrity and reliability of various
`materials under different conditions and is crucial for those designing structural applications. In this blog post,
`we look at the concept of stress relaxation, its occurrence in viscoelastic materials, and its importance in the
`design and application of materials.
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`What is Stress Relaxation of Materials?
`WHAT IS STRESS RELAXATION OF MATERIALS?
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`12/16/24, 11:19 AM
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`What is Stress Relaxation of Materials?
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`Stress relaxation is the gradual reduction in stress over time while maintaining a constant strain. It is
`commonly observed in viscoelastic materials, particularly polymers, which show time-dependent relaxation
`when subjected to stress or strain. When a stress relaxation experiment is conducted, a sample is rapidly
`strained to a xed length at a constant temperature, and the stress is recorded as a function of time. During the
`experiment, the length of the sample remains constant, allowing stress relaxation to occur at a molecular level
`through molecular relaxation and viscous ow.
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`It is important to differentiate stress relaxation from creep, as they are distinct phenomena. Creep
`(https://alemnis.com/creep/) involves the constant application of stress while adding an increasing amount of
`strain. Creep experiments are conducted by subjecting a material to a constant stress and recording the
`resulting strain over time. In contrast, stress relaxation experiments involve applying a constant strain and
`monitoring the stress response over time. These differing experimental setups highlight the unique
`characteristics of stress relaxation and creep in materials.
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`Various factors inuence the rate of stress relaxation in polymers, including the type of polymer, the presence
`of llers, strain levels, strain rates, and temperature. Additionally, the polymer’s stress relaxation behavior can
`be signicantly impacted by the nature and composition of the polymer. 
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`It’s also important to know that the stress relaxation rate depends on the strain levels and strain rates applied
`to the material. Higher strain levels and faster strain rates typically lead to more rapid stress relaxation.
`Temperature also plays a vital role in stress relaxation, as higher temperatures generally result in faster
`relaxation.
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`Furthermore, external factors alone do not determine stress relaxation as it is also inuenced by the intrinsic
`properties of the material. This includes its alloy, temper, and orientation. Considering these factors is crucial in
`accurately predicting and designing materials for specic applications.
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`Understanding stress relaxation is paramount when designing and selecting materials for structural
`applications because prolonged exposure to stress can result in irreversible deformation in plastic materials,
`compromising their structural integrity.
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`The data obtained from stress relaxation testing is particularly valuable in failure analysis and predicting
`material behavior under specic loading conditions. By accounting for stress relaxation, engineers can
`accurately model and simulate the long-term performance of materials, improving the overall reliability and
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`ClearCorrect Exhibit 1064, Page 2 of 5
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`Stress Relaxation: Denition and Phenomenon
`Stress Relaxation vs. Creep
`Factors Inuencing Stress Relaxation
`Importance of Stress Relaxation in Design and
`Applications
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`12/16/24, 11:19 AM
`safety of structural components.
`
`What is Stress Relaxation of Materials?
`
`As scientic experts, it is essential to recognize the signicance of stress relaxation and its implications in
`various industries. At Alemnis, we are dedicated to providing leading micro- and nanomechanical property
`measurement instruments in a range of material science applications.
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`Our Alemnis Standard Assembly (ASA) (https://alemnis.com/asa/) is a unique and powerful solution used
`reliably for stress relaxation measurements. It can be used in in-situ, ex-situ, in synchrotron, and Micro CT
`congurations in true displacement mode for understanding compression artifacts, load drops, strain rate
`jumps, and sudden load excursions in real-time.  
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`To ensure your stress relaxation measurements are accurate and reliable, contact Alemnis today, and let us
`show you the solution.
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`Alemnis is a global leader in nanoindentation and micromechanical testing, known for its precision and innovation.
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`Trusted worldwide, Alemnis is at the forefront of advancing materials science and engineering.
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