= Rajnish Kumar
{disambiguate=materials scientist}
{c}
<Rajnish Kumar (materials scientist)> is a researcher in mechanical testing of <composite materials>. His institutional profile identifies him within DTU's composites manufacturing and testing group and gives ORCID 0000-0002-1243-9585, distinguishing this materials researcher from namesakes.<Rajnish Kumar profile at DTU>[Profile heading, research group and ORCID]{ref}
He was first and corresponding author of the 2020 glass- and carbon-fibre study with <Lars Pilgaard Mikkelsen>, <Hans Lilholt> and <Bo Madsen (materials scientist)>. Their semi-automated <single-fibre tensile test> examined stress-strain-based modulus determinations. The public abstract reports an approximately strain-independent true-stress-based <tangent modulus> for the tested glass fibres, while the tested carbon fibres showed a tendency for that modulus to increase with strain.<Understanding the mechanical response of glass and carbon fibres: stress-strain analysis and modulus determination by Rajnish Kumar and others>[Primary byline, corresponding-author mark and abstract, tangent-modulus findings]{ref}
That distinction explains why one fitted <Young's modulus> need not summarize an entire <stress-strain curve>. A local slope and a slope fitted over a finite strain interval answer different questions; their definitions must accompany a comparison. The result concerns the tested specimens and the stated analysis, rather than every glass or carbon fibre. The associated dataset names Kumar as a contributor and preserves individual records and compliance calculations, allowing those measurement assumptions to be examined.<Single fiber tensile test - Glass and Carbon fibers by Rajnish Kumar and others>[Contributor list and description of records and compliance files]{ref}
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