Abstract
Antonio Signorini’s contribution to the constitutive theory of non-linear elasticity is reconstructed and analyzed. Some uninformed opinions suggesting he had a minor role, lacking of significant results, are discussed and refuted. It is shown that Signorini should be rightly credited for being among the first scholars aware of the central problem of non-linear elasticity: the determination of the general form of the elastic potential.
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Notes
Tesi di Laurea.
This series of congresses are today known as “ICTAM: International Conference of Theoretical and Applied Mechanics”.
This quote is from the material added in the preface to the third edition of Truesdell and Noll (1965), published in 2004.
“Fatta più col cuore che col cervello”.
Associazione Italiana di Meccanica Teorica ed Applicata.
“L’uso della lingua italiana, poco conosciuta fuori d’Italia, i contatti poco frequenti tra gli Studiosi e le difficoltá presentate dal difficile algoritmo delle omografie, strumento preferito da Signorini, hanno fatto si che la Sua opera fosse poco conosciuta all’estero e, a volte, nel nostro stesso Paese.”
Omografia (in Italian).
A first edition of this text was published in French in Burali-Forti and Marcolongo (1912).
Omografia vettoriale.
“Una trattazione assoluta di tutte le questioni fisico-meccaniche-geometriche, indipendentemente da qualsiasi sistema di coordinate.”
“Venti anni di lotte, di studi e di un lavoro condotto con fede e con costanza.”
On the basis of Picone’s and Fichera’s recollections, Signorini in the last months of his life, already confined at home for health reasons, often and apprehensively asked for progress on the solution of this problem.
Istituto Nazionale di Alta Matematica. This congress had very little international scope due to the world war situation. In fact, only sixteen mathematicians from outside Italy, and only from ‘allied’ or neutral countries, were present: no English or French mathematicians at all.
“...prima di ogni calcolo numerico si ha da affrontare un problema estremamente difficile di vera Fisica matematica: la scelta dell’espressione completa del potenziale elastico.”
“Il problema che ben si può dire il problema centrale dell’intera teoria non linearizzata, è il problema della scelta dell’espressione completa del potenziale elastico.”
Today, this center is known as the Tun Abdul Razak Research Centre.
For Hadamard, a mathematical model of a physical phenomenon is well posed if: (i) the solution exists; (ii) the solution is unique, and (iii) the solution’s behavior depends with continuity on the initial conditions.
In Truesdell and Noll (1965) we read: “The radically simpler nature of the incompressible material in finite deformations was seen by Rivlin and exploited in a sequence of remarkable papers in 1948–1954.”
The full determination of such family of strain-energy densities can be found in Mangan et al. (2016).
See, for example, the review article (Savin and Koifman 1970) published in 1970.
Georg Hamel (1877–1953).
“Ho fatto vedere che il problema centrale della teoria delle trasformazioni termoelastiche finite, in sostanza si riduce alla scelta del potenziale isotermo \(W_{\tau }\) per ogni valore di \(\tau \).”
“Questa mia presunzione venne avvalorata, fin dal 1955, da un fatto almeno per me inaspettato: per sistemi incomprimibili l’ipotesi caratteristica dell’Elasticitá di secondo grado impone al potenziale isotermo una forma che – ove si annulli uno dei tre parametri in essa disponibili – è proprio la forma proposta da Mooney nel 1950 e poi sottoposta con successo anche a svariati controlli sperimentali”.
A female student of Vito Volterra for whom, at the moment, there are no relevant historical notices.
Ariano’s scientific production would certainly deserve an appropriate discussion, out of the scope of the present manuscript.
It is clear that Brillouin obtained his result independently of Crudeli. They were completely different scientists with different interests. This topic was only a tiny intersection of their scientific production.
GAMM’s conference in 1955, whose English translation by Truesdell himself can be found in Truesdell (1965a).
Truesdell makes use of the letter \(\Sigma \) rather than W.
Here we are using the term robust in the usual sense of the philosophy of science (Soler et al. 2012).
\(\Sigma \) is the symbol for the strain-energy density.
We notice another strange situation about papers Truesdell (1952b, 1952c). Let us denote them, conventionally, as the first and the second one. In the second one (Truesdell 1952c) (received by the journal on July 16, 1951) Truesdell cites the first paper saying “The material treated here and many other related topics are summarized in Truesdell (1952b)”. It is clear that the first paper is not a summary of the second one because since 100 pages are much more than the 20 pages of the second one, which is cited in Truesdell (1952b) as “forthcoming”.
Con questa Memoria l’A. continua l’esposizione sistematica delle sue ricerche nell’ambito della Elasticitá non linearizzata, per dare completo sviluppo a quanto più o meno sinteticamente giá si trova esposto in conferenze tenute a Stoccolma [\(3^\text {o}\) Congr. int. di Mecc. appl., 1930], a Palermo [XXIV Riunione della S. L P. S., 1935], a Bologna [\(2^\text {o}\) Congr. della U. M. I.,1940], a Roma [Convegno mat. del 1942] e a Londra [\(7^\text {o}\) Congr. int. di Mecc. appl., 1948].
It is well known that Biot’s work was somewhat “censored” in Truesdell and Noll (1965), where the theory of small on large deformations has been considered in details but only one paper by Biot on waves is cited, with no comments at all.
Questa seconda memoria non richiede una speciale introduzione, perché i principali suoi risultati giá si trovano esposti e commentati nelle pubblicazioni citate nel Sunto.
“Sulla deduzione del potenziale elastico dall’esperienza”
“Non ragioniam di lor, ma guarda e passa” Dante, Inf. III, 51.
“...poi richiamare l’attenzione su certi fatti non banali che possono presentarsi nella teoria non linearizzata: “non banali” nel senso che completamente sfuggono alla teoria classica.”
Nikoloz (Niko) Muskhelishvili 1891–1976.
“Nel settembre scorso, durante il congresso internazionale, tenutosi a Tihilis, in Georgia dalla Societá Internazionale di Meccanica Applicata, Antonio Signorini fu ricordato con commosse parole dal Presidente del Congresso, il grande matematico russo Muskhelishvili”.
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Partially supported by “Gruppo Nazionale per la Fisica Matematica” (GNFM) of “Istituto Nazionale di Alta Matematica” (INDAM), Italy.
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Saccomandi, G., Vianello, M.S. Antonio Signorini and the proto-history of the non-linear theory of elasticity. Arch. Hist. Exact Sci. 78, 375–400 (2024). https://doi.org/10.1007/s00407-024-00328-2
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DOI: https://doi.org/10.1007/s00407-024-00328-2