---
id: "20260822-0220-did-the-sulskychenschreyer-material"
title: "Did the Sulsky–Chen–Schreyer Material Point Method collaboration actually start in 1993, or does it trace back to an earlier Sandia report (SAND91-7095)?"
type: "capture"
status: "promoted"
origin: "batch"
promoted_to: ["claim-sand91-7095-predates-1993-mpm-founding-report","claim-sand91-7095-abstract-describes-same-mpm-mechanism","claim-schreyer-bibliography-confirms-1992-asme-publication","entity-howard-schreyer (new hub)","entity-deborah-sulsky (updated additively)","claim-material-point-method-1993-sandia-funded-penetration-mechanics (corrected in place per §6, dated Correction block added)","question-sand91-7095-full-text-needed (new question)","question-mpm-development-start-date-1991-vs-1993 (marked answered)"]
not_promoted: ["OSTI duplicate-catalog-entry artifact (two OSTI IDs for the same report) — folded as supporting detail into claim-sand91-7095-predates-1993-mpm-founding-report rather than given its own note; it's a cataloging quirk, not a distinct claim.","DOE contract-number mismatch (AC04-76DP00789 on SAND-91-7095 vs. AC-1801 on SAND93-7044/CMAME 1994) — folded as an aside into claim-sand91-7095-predates-1993-mpm-founding-report; interesting but not load-bearing to any kept claim, so not routed to 50-questions per the intake-discipline rule against promises for nice-to-verify details.","SAND report-number-prefix ('91') as circumstantial evidence of a 1991 start — the capture itself flags this as a plausible inference only, not a sourced claim; correctly left unpromoted.","Two-author 1993 Sulsky–Schreyer penetration paper (no Chen) — folded as an aside into claim-schreyer-bibliography-confirms-1992-asme-publication; raises a minor question about collaboration membership stability but nothing kept rests on it, so no 50-questions entry. Logged as a [watch] line in 00-meta/seek-flags.md instead.","Entity candidate: Zhen Chen — declined. Third co-author, already named in three existing hub pages and multiple claim-notes, but this capture supplies no source specifically about him (only his absence from one paper) — same 'no distinctive angle yet' bar that previously held Schreyer back. Left as a mention.","Entity candidate: SAND-91-7095 as its own document/concept page — declined. No full text located; a bare catalog record with no independent secondary discussion doesn't yet clear the entity-page bar the way a read primary document would.","Entity candidates F.H. Harlow and J.U. Brackbill — both already existing hubs; this capture surfaces nothing new specifically about either (only reaffirms the existing PIC→FLIP→MPM lineage they already document), so neither page was touched."]
writer_model: "claude-sonnet-5"
date_created: "2026-08-22T00:00:00.000Z"
provenance: "Batch research run, 2026-08-22, answering [[question-mpm-development-start-date-1991-vs-1993]]"
derived_from: []
tags: ["material-point-method","sandia","sulsky","primary-source-verification","history-of-computing","computational-mechanics"]
seek_code_commit: "17d9798"
---


This capture directly answers [[question-mpm-development-start-date-1991-vs-1993]], the open
question spun off during the 2026-08-21 promotion that verified
[[claim-material-point-method-1993-sandia-funded-penetration-mechanics]]'s funding and motivation
legs against the primary 1994 CMAME paper. That promotion could not locate the specific lead
toward an earlier Sandia report, "SAND91-7095," in the time available and left the "1993 start"
dating unconfirmed. This session located it, on OSTI.GOV's own catalog rather than general web
search. **Verdict: the collaboration did not start in 1993. A distinct, earlier Sandia report by
the same three authors — SAND-91-7095 — was cataloged in 1992, and an independent 1992 ASME
conference-proceedings paper under the identical title corroborates that the work had already been
formally published a year before the date the vault's existing claim-note carries.**

## Claim: SAND-91-7095, a distinct Sandia technical report by Sulsky, Chen and Schreyer, predates the 1993 report and paper by at least a year

OSTI.GOV — the U.S. Department of Energy's own technical-report catalog — carries a record for
"The application of a material-spatial numerical method to penetration" by the same three authors
(Sulsky, Chen, Schreyer), with report number SAND-91-7095, distinct from the 1993 report
SAND93-7044 that the vault's existing claim-notes already rest on. The record's own catalog date is
1992 (both duplicate OSTI entries for this report give citation year 1992), a full year ahead of
the "started in 1993" framing in [[claim-material-point-method-1993-sandia-funded-penetration-mechanics]].
OSTI carries two separate catalog entries for what appears to be the same underlying report (OSTI
IDs 5900384 and 10118944) — a duplicate-cataloging artifact rather than two different documents;
both give an identical title, author list, and report number. No digital full-text copy is
available through OSTI for either entry.

This is a historical/dating claim and, because it directly overturns a specific date already
resting in the vault, is treated as load-bearing per the sourcing floor's escalation rule — it
needs Tier 1–2, not Tier 3–4. It clears that bar: this is the government's own primary
bibliographic record of its own funded report, not a secondary description of one.

- source_url: https://www.osti.gov/biblio/5900384
- source_sha: f96ee695b0188840ef1d522ddaea2e68c462a6f26b578a6a0e0ae563953a160e
- source_title: "The application of a material-spatial numerical method to penetration"
- source_author: "Sulsky, D; Chen, Zhen; Schreyer, H L"
- source_date: "1992 (OSTI catalog/citation year; a duplicate OSTI entry for the same report, ID 10118944, displays a Dec 31 1991 timestamp — almost certainly a UTC-midnight-to-Eastern-time display artifact of the same bare '1992' year field, not a second confirmed date)"
- source_venue: "Sandia National Laboratories technical report SAND-91-7095, cataloged via OSTI.GOV (U.S. DOE Office of Scientific and Technical Information), OSTI ID 5900384"
- source_quote: "Report Number(s):SAND-91-7095; ON: DE92006616"
- source_tier: 1

## Claim: The report's own abstract describes the same core material-point-in-a-fixed-grid mechanism as the later 1993/1994 papers — this is the same research program, not an unrelated report

OSTI's cataloged abstract for SAND-91-7095 states: "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 that
[[claim-mpm-founding-papers-motivated-by-broad-problem-class]] already establishes for the 1993
Sandia report and 1994 CMAME paper — confirming SAND91-7095 is an earlier iteration of the same
program, not a coincidentally-similar, unrelated report.

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

- source_url: https://www.osti.gov/biblio/5900384
- source_sha: f96ee695b0188840ef1d522ddaea2e68c462a6f26b578a6a0e0ae563953a160e
- source_title: "The application of a material-spatial numerical method to penetration"
- source_author: "Sulsky, D; Chen, Zhen; Schreyer, H L"
- source_date: "1992 (OSTI catalog year)"
- source_venue: "Sandia National Laboratories technical report SAND-91-7095, cataloged via OSTI.GOV, OSTI ID 5900384"
- source_quote: "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."
- source_tier: 1

## Claim: An independent record — Howard Schreyer's own faculty publication list — corroborates that this work reached formal ASME conference publication in 1992, a year before the vault's "1993 start" claim

Howard L. Schreyer's own University of New Mexico faculty page lists, under a "1992" heading:
"Sulsky D., Chen, Z., and Schreyer, H.L., 1992, "The Application of a Material-Spatial Numerical
Method to Penetration," New Methods in Transient Analysis, AMD-Vol. 143, Edited by P. Smolinski,
W.K. Liu, G. Hulbert and K. Tamma, The American Society of Mechanical Engineers, NY, NY, 91-
102." This is the identical title carried by SAND-91-7095, confirming the Sandia report was not
merely an internal technical report but was also formally published in ASME conference proceedings
in 1992 — a peer-venue publication, not just a lab-internal document.

This is a historical/priority claim and, being the load-bearing point of this capture, needs
Tier 1–2. It clears the floor as a maker's own self-published record of his own bibliography (the
"person speaking, on their own venue" test from the sources rubric) — though it should be read as
corroborating publication and existence, not as fully independent verification: Schreyer is himself
one of SAND91-7095's three authors, so this is the same author group citing itself, on a different
venue (his own site vs. OSTI's catalog), rather than a wholly independent third party.

- source_url: http://www.unm.edu/~schreyer/selected-publications.html
- source_sha: 2e77a198b70030e3f5eae308b26064b2068d16b27dd8dfea20840b6f66fba732
- source_title: "Schreyer Publications"
- source_author: "Howard L. Schreyer"
- source_date: "page undated; entry listed under a '1992' heading"
- source_venue: "unm.edu, Howard L. Schreyer's personal faculty page (University of New Mexico)"
- source_quote: "Sulsky D., Chen, Z., and Schreyer, H.L., 1992, \"The Application of a Material-Spatial Numerical Method to Penetration,\" New Methods in Transient Analysis, AMD-Vol. 143, Edited by P. Smolinski, W.K. Liu, G. Hulbert and K. Tamma, The American Society of Mechanical Engineers, NY, NY, 91- 102."
- source_tier: 1
- source_delight: The same faculty page's full chronological list independently shows the collaboration continuing across 1992–1995 in shifting configurations (a two-author Sulsky/Schreyer penetration paper in 1993, alongside the three-author Sulsky/Chen/Schreyer line) — a maker's own running bibliography, not a citation database's reconstruction of one.

## Further leads

- SAND91-7095's DOE contract number, per OSTI, is AC04-76DP00789 — a different contract number from the AC-1801 credited in SAND93-7044 and the 1994 CMAME paper's acknowledgment ([[claim-mpm-1994-paper-acknowledges-sandia-and-nsf-cofunding]]); worth checking whether this reflects a change in funding vehicle between 1991/92 and 1993, or just Sandia's general operating contract vs. a specific research contract. [unverified — needs primary]
- SAND-91-7095's report-number prefix ("91") is consistent with, but does not by itself confirm, research activity beginning in 1991 rather than 1992 — Sandia's SAND-report numbering convention was not independently sourced this session, so this is noted as a plausible inference only, not a dated claim.
- The full text of SAND-91-7095 / the AMD-Vol. 143 conference paper could not be located online (OSTI has no digital copy; no PDF found via general web search) — a genuine candidate for a physical/ILL retrieval to confirm the mechanism claim above against the report's own body text rather than its cataloged abstract.
- Schreyer's faculty page separately lists a two-author (Sulsky and Schreyer only, no Chen) 1993 paper, "A Particle Method with Large Rotations Applied to the Penetration of History-Dependent Materials" (ASME AMD-Vol. 171), alongside the three-author 1993/1994 line — suggesting the "collaboration" was not a single fixed three-person unit across this period but shifted membership paper to paper. [unverified-historical — needs primary read of that paper's own text]

## Entity candidates

- F.H. Harlow — person — the FOUNDATIONAL figure the entire PIC→FLIP→MPM lineage (including SAND91-7095 and its 1993/1994 descendants) measures its own novelty against; already an existing hub, [[entity-francis-harlow]], flagged first per the standing blind-spot instruction rather than after the paper's own co-authors.
- J.U. Brackbill — person — co-developer of FLIP, the immediate methodological predecessor both the 1991-92 and 1993-94 Sulsky/Chen/Schreyer reports build on; already an existing hub, [[entity-j-u-brackbill]].
- Deborah Sulsky — person — lead author across both the 1991-92 and 1993-94 reports; already an existing hub, [[entity-deborah-sulsky]].
- Howard L. Schreyer — person — co-author on SAND91-7095, SAND93-7044, and the 1994 CMAME paper; previously left unpromoted in the 2026-08-21 capture for lacking an individually distinctive angle, but this session's find is his own maintained faculty bibliography page — the primary record that resolves this capture's core dating question — which may now clear the entity-page-spec bar on its own terms.
- Zhen Chen — person — third co-author on SAND91-7095 and SAND93-7044/CMAME 1994; absent from the two-author 1993 Sulsky–Schreyer penetration paper noted above, raising a small open question about how fixed the "three-person collaboration" framing actually was.
- SAND-91-7095 ("The application of a material-spatial numerical method to penetration") — document/concept — the earlier Sandia report itself; a candidate for its own primary-source note if the full text is ever located, parallel to how SAND93-7044 already anchors [[claim-mpm-founding-papers-motivated-by-broad-problem-class]].