I have seen many articles[1] that write in the title "mechanical properties of ...", but in the subsections of the paper, they write "elastic properties" and discuss elastic properties.

I would like to know if elastic and mechanical properties are the same, or is there any difference between them.


  1. Yue, Q.; Kang, J.; Shao, Z.; Zhang, X.; Chang, S.; Wang, G.; Qin, S.; Li, J. Mechanical and electronic properties of monolayer MoS2 under elastic strain. Phys. Lett. A 2012, 376 (12-13), 1166–1170. DOI: 10.1016/j.physleta.2012.02.029.
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    $\begingroup$ Mechanical property is the larger domain and elastic property is subset. Mechanical property contains all sort of properties from elasticity,plasticity,fracture,damage etc. Here in this paper, they are dealing with constitutive behavior only. $\endgroup$ Jan 30, 2022 at 14:50
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    $\begingroup$ @pranavkumar seems that should be written as an answer! $\endgroup$ Jan 30, 2022 at 17:41
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    $\begingroup$ @pranavkumar thanks brother, if you could just write it with more details as an answer. $\endgroup$
    – Chi Kou
    Jan 31, 2022 at 10:04

1 Answer 1


When we talk about mechanical properties, we generally refer to response of the material on application of external load. Apart from external load, responses can be of mixed nature, such as thermo-mechanical response. In the broader sense, mechanical properties have a very wide domain, and subsets of these domains often overlap. For example, the non-linear response of material that may be elastic or plastic in nature.

Even if we focus only on elastic response, we encounter linear and non-linear behavior of material against deformation. It all depends on type of material, external stimuli, and its internal configuration. Talking about elastic properties, many research groups majorly deal with constitutive behaviour of small material domain at atomic scale. These small scale modelling results are used in higher length scale simulations to mimic the material response at the macroscopic level.

Furthermore, depending upon the symmetry of the crystal, the number of independent elastic constants which defines this constitutive behavior also varies. Here in the above paper, the author is considering average elastic behaviour of two-dimensional structure on the application of small strain. The consideration of elastic constants are based on small deformation theory and material is taken as homogeneous isotropic hookean material where Young's modulus was derived from the second derivative of the strain energy. Again other properties such as in-plane stiffness and Poisson's ratio were also calculated using this same above assumption.


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