The Material Point Method was developed in 1993 for solid-mechanics penetration problems, with funding from Sandia National Laboratories

The Material Point Method (MPM) is the direct descendant of the Los Alamos particle-in-cell method (claim-pic-method-born-at-los-alamos-for-hydrodynamics), by way of Brackbill's FLIP (1986). Per Wikipedia's account, "Motivated by the need for better simulating penetration problems in solid dynamics, Sulsky, Chen and Schreyer started in 1993 to reformulate the PIC and develop the MPM, with funding from Sandia National Laboratories." MPM extends the hybrid Eulerian/Lagrangian idea from compressible fluids to history-dependent solid mechanics — materials whose response depends on their deformation history, which is exactly what penetration (a rigid body driving through a resisting, yielding solid) demands.

This is the middle link of the lineage's cross-domain bridge: a second weapons-laboratory touchpoint (Sandia, after Los Alamos) sitting between Cold War hydrodynamics and, twenty years later, Disney's snow solver (claim-frozen-snow-ran-on-material-point-method-matterhorn). The continuum-mechanics problem is structurally the same at both ends — something rigid moving through something granular that resists and then yields — which is why the method could migrate from penetration to snow without reinterpretation. It rhymes with other histories in the vault of defense- and weapons-lab research shedding into civilian use, e.g. MIT's 1973 divestment of its Instrumentation Lab (claim-mit-1973-divested-instrumentation-lab-as-draper-under-antiwar-protest).

Sourcing caveat. This note rests on a Tier 4 aggregator (Wikipedia) and carries an [unverified-mechanism] flag: the specific attribution of MPM's origin to penetration-problem motivation and Sandia funding has not been checked against the primary paper (Sulsky, Chen & Schreyer, Computer Methods in Applied Mechanics and Engineering, 1994). It stays seedling until that verification lands (question-verify-mpm-1993-sandia-penetration-primary).