Engineering Transactions, 7, 3, pp. 363-411, 1959

Badania Pewnych Reologicznych Własności Elastooptycznych Kilku Żywic Poliestrowych (I)

J.T. Pindera
Zakłada Budownictwa Polskiej Akademii Nauk

In the present state of development of photoelastic methods, it is necessary to devote more attention to the investigation of the properties of materials for models, especially for loads of long duration. The influence of loads of long duration on the photoelastic properties of materials was tested by various authors, several measurement methods being used. The tests carried out, usually with beams subjected to pure bending with moments of constant value or prismatic specimens subjected to a progressively increasing load, were confined to the investigation of the optical creep with constant load. Some of the investigations of photo- elastic creep are analyzed in the present paper, and reveal the incompleteness of the investigation methods over the photoelastic properties of materials hitherto employed.
For a homogeneous practically one-axial stress field an investigation method and technique is proposed, involving models in the form of slender wedges, stretched by a constant axial force.
Methods and technique of tests of creep and optical retardation with
periodic loads are also advanced. The structure and properties of the polyester resins (CR-39 resin, VP-1527 resin and P-6 palatal resin) are analyzed on the basis of the literature.
A program is suggested for tests concerning the creep and elasto-plastic retardation with static and periodic loads, in such a manner that the results obtained may be interpreted from the structural and rheological point of view and constitute an introduction to further investigation of photoelastic vibro-creeping.

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J. T. Pindera, Współczesne kierunki rozwojowe metod elastooptyki i możliwości ich zastosowania do rozwiazywania zagadnień mechaniki budowli, Ksiega Pamiatkowa dla uczczenia zasług naukowych prof. W. Wierzbickiego (w druku).

W. Stauffer i A, Keller, Besondere Erscheinungen beim Zeitstand- versuch, Schweizer Archiv, Dezember 1956.

E. G. Cooker and L. N. Filon, A Treatise on Photoelasticity, Cambridge University Press 1957. (1932).

D. J. Coolidge, An Investigation of the Mechanical and Stress-Optical Properties of Columbia Resin CR-39, E.S.A. V. VI, nr 1/1948.

R. Hiltscher, Gütebeurteilung spannungsoptischer Modellwerkstoffe, Forschung 20 Bd, Heft 3, 1954.

J. Aubaud, Recherches sur la rélation contrainte-biréfrigence dans le plexiglas M222, La Recherche Aéronautique, 26, 11952.

J. Marin and J. E. Griffith, Creep Relaxation of Plexiglas II A for Simple Stress, J. Engin. Mech. Div. Proc. of. A. S.C.E., July 1956.

A.J. Guzetti, Measurement of Cure Rate of Thermosetting Moulding Materials, ASTM Bull. Febr. 1957.

R. Hiltscher, Spannungsoptische Untersuchung elastoplastischer Spannungszustände, Z.VDI, Bd. 95, nr 23, 11 August 11953.

R. Hiltscher, Theorie and Anwendung der Spannungsoptik im elasto- plastischen Gebiet, Z. VDI, 97, nr 2, 111 Januar 1955.

J. Lesavre, Le fluage des thermoplastiques, R.G.C. Vol. 30, nr. 12, 1953.

E. Mönch, Die Disperssion der Doppelbrechung als Mass für die Plastizität bei spannungsoptischen Versuchen, Forschung, Heft 1, 1955.

[in Russian]

R. Houwink, Elastomers and plustomers, Vol. I, Elseviers Publ. Co. New York, 1950.

M. M. Frocht and A. A. Thomson, Studies in Photoplasticity, Illinois Inst. Techn., Dez. 1957. Referat na Sympozjum Niejednorodności w Teorii Sprężystości Plastyczności, Warszawa 1958.

H. A. Stuart, Die Physik der Hochpolymeren, Dritter Band Vierter Band, J. Springer, Berlin 1956.

A, M. Freudenthal, Inelasttches Verhalten von Werkstoffen, (tlum. Z ang.), Verlag Technik, Berlin 1955.

H. Schwieger und I. Trager, Kinematographische Auflösung der

Biegewellenausbreitung beim Balkenquerstoss, Experim. Techn. Phys., Heft 5, 1957.

H. Schwieger, Spannungsoptische Methoden zur Untersuchung dynamischer Spannungszustände, Experim. Techn, Phys., Heft 2, 1956.

Prospekt fabryczny Nr 88524, Januar 1955. Palatal P-6. Badische Anilin Soda-Fabrik A.G.

B. Lewicki i J. T. Pindera, Model elastooptyczny konstrukcji zbro-

jonej, Arch. Inzyn. Lad., nr. 4, 1956.

H. T. Jessop iF. C. Harris, Photoelasticity. Principles and Methods,

Cleaver-Hume Press, London 1949.

L. Föppl, Fortschrifte in der Spannungsoptik, Kunststoffe, B. 43, 346, 1953.

H. Titschack, Ein Beitrag zur Frage des Modellwerkstoffes im ebenen und räumlichen spannungsoptischem Versuch, Dynamit-Actien-Gesellschaft, Troisdorf (bez daty po r. 1954).

W. Horth, Technische Schwingungslehre, J. Springer, Berlin 1922.

J. T. Pindera, Technika badań elastooptycznych płaskiego stanu naprężenia, Rozpr. Inzyn., 1, 3 (1955).