= Hans Lilholt
{c}
<Hans Lilholt> is a <materials scientist> whose DTU profile identifies research on <composite materials>, their preparation and their physical and mechanical properties.<Hans Lilholt profile at DTU>[Personal profile, materials and mechanical-properties research]{ref} He is a named contributor to the glass- and carbon-fibre tensile dataset, alongside <Rajnish Kumar (materials scientist)>, <Bo Madsen (materials scientist)> and <Lars Pilgaard Mikkelsen>.<Single fiber tensile test - Glass and Carbon fibers by Rajnish Kumar and others>[Full contributor list]{ref}
With <Bo Madsen (materials scientist)> and <Rajnish Kumar (materials scientist)>, he coauthored a 2024 experimental study of the <vibroscope> method for estimating fibre <cross-sectional area> from vibration under <tension>. It compared three analysis procedures and used tensile stress-strain curves in assessing the area estimates.<Vibroscope method for determination of cross-sectional area of glass and carbon fibres – Experiments and analyses by Bo Madsen and others>[Primary byline and public abstract, frequency measurements and comparison of analysis procedures]{ref}
An original calculation shows why this metrology affects a strength claim. At fixed measured <force>, inferring an area $\hat A=0.98A$ produces inferred <engineering stress>
$$
\hat\sigma=\frac{F}{\hat A}=\frac{\sigma}{0.98}\approx1.0204\sigma.
$$
A chosen two-percent area underestimate therefore gives about a 2.04-percent stress overestimate. This is an illustrative calculation, not a new measurement from that study. The area measurement and its analysis belong alongside the reported tensile result; a force record alone does not determine material <stress>.
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