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Tomasz Wierzbicki is an applied-mechanics researcher and MIT emeritus professor whose work concerns plastic deformation, structural failure and crashworthiness. His MIT curriculum vitae lists research comparing experimental sheet fracture and tearing with numerical predictions; the laboratory account identifies dynamic plasticity and structural failure as central research themes.^[ref]

His structural-mechanics teaching makes the relation between measurement and model explicit. A uniaxial tensile test measures axial force, extension and lateral contraction. Those observations determine Young's modulus and Poisson's ratio under the stated loading conditions, rather than treating material parameters as properties of a specimen's shape.^[ref]

An original work calculation illustrates a related structural-design distinction. A constant resisting force of $3\mathrm{kN}$ over a compression stroke of $0.1\mathrm{m}$ takes input work $300\mathrm{J}$. A triangular force–displacement curve with the same peak and stroke has area $150\mathrm{J}$. Equal peak loads therefore need not imply equal energy input. The area under the measured curve, together with unloading behaviour, helps distinguish total work from recoverable elastic energy.

These are illustrative curves, not measurements from a Wierzbicki experiment. His work on structural failure and constitutive models addresses the broader task of connecting geometry, material response and observed load histories.