Rajnish Kumar 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.[ref]
He was first and corresponding author of the 2020 glass- and carbon-fibre study with Lars Pilgaard Mikkelsen, Hans Lilholt and Bo Madsen. 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.[ref]
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
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.[ref]
Single fiber tensile test - Glass and Carbon fibers by Rajnish Kumar and others. Contributor list and description of records and compliance files
- Single fiber tensile test - Glass and Carbon fibers by Rajnish Kumar and others
- Understanding the mechanical response of glass and carbon fibres: stress-strain analysis and modulus determination by Rajnish Kumar and others
- Vibroscope method for determination of cross-sectional area of glass and carbon fibres – Experiments and analyses by Bo Madsen and others
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