SAND-91-7095's cataloged abstract already describes MPM's core material-point-in-a-fixed-grid mechanism

material-point-methodsandiasulskyprimary-source-verificationhistory-of-computingcomputational-mechanicsunverified-mechanism

OSTI's cataloged abstract for SAND-91-7095 (see the report's dating) reads: "A new numerical scheme involving the flow of material points through a fixed Eulerian grid is described. Constitutive equations are applied at the material points while gradients are invoked through the use of the fixed grid so mesh distortion is not a factor." This is the same hybrid material-point/fixed-grid mechanism claim-mpm-founding-papers-motivated-by-broad-problem-class already establishes for the 1993 Sandia report and 1994 CMAME paper — the same core idea, in the same authors' words, a year or more earlier. It confirms SAND-91-7095 is an earlier iteration of the same research program rather than a coincidentally similar, unrelated report.

This is a specific technical-mechanism claim, which the sourcing floor holds to Tier 1–2. The text is OSTI's own cataloged abstract for a government-funded report — DOE's own primary bibliographic record, and the standard convention for reports of this vintage catalogued before routine full-text digitization — but OSTI states no digital full-text copy of the report itself is available. The mechanism description here has therefore been checked against the report's own abstract, not its body text, the way the 1993/1994 mechanism claims were checked directly against PDFs. Recorded at Tier 1 as a government primary catalog record, with that gap stated plainly rather than silently upgraded to "read the full report."