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  • 1
    Call number: ZSP-201-76/3
    In: CRREL Report, 76-3
    Description / Table of Contents: A world-wide review of the literature applicable to the design of harbors and channels in cold regions was conducted. Forces due to ice movement present the dominant factor in the design of marine structures in cold regions. Expressions for calculating the ice force are presented. Other factors relating to design criteria such as construction materials, structure geometry, and methods of ice suppression are discussed.
    Type of Medium: Series available for loan
    Pages: iii, 32 S.
    Series Statement: CRREL Report 76-3
    Branch Library: AWI Library
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  • 2
    Series available for loan
    Series available for loan
    Hannover, NH : U. S. Cold Regions Res. and Eng. Laboratory
    Associated volumes
    Call number: ZSP-201-79/2
    In: CRREL Report, 79-2
    Description / Table of Contents: The stress-density relaionships of snow-water mixtures were investigated and are shown as functions of water content, initial snow density, initial snow-water mixture density and rate of deformation. An increase in water content in snow at a particular density or a decrease in the rate of deformation (or strain rate) decreases the stress, but apparently not the specific energy required to reach a specific mixture density.
    Type of Medium: Series available for loan
    Pages: v, 26 S. : Ill.
    Series Statement: CRREL Report 79-2
    Language: English
    Note: CONTENTS Abstract Preface Nomenclature Introduction Description of study Sample preparation Test equipment and procedure Test sample characteristics Discussion of results Data presentation format Effect of water content and mixture density Effect of water content and initial snow density Effect of deformation rate Effect of water content and rate of deformation on specific energy Summary Literature cited Appendix A. Derivation of equations Appendix B. Load-deformation traces ILLUSTRATIONS Figure Test setup Relationships between initial density of snow, density of snow-water mixture, water content and saturation Density range of test samples Snow density and water content range of test samples Major principal stress vs density for various water contents 0.4 g cm3, v = 0.042 cm s’) Major principal stress vs density for various water contents 0.4 g cm-3, v = 0.42 cm s’) Major principal stress vs density for various water contents 0.4 g cm’, v = 4.2 cm s’) Major principal stress vs density for various water contents 0.5 g cm’, v = 0.042 cm Major principal stress vs density for various water contents 0.5 g cm’, v = 0.42cm s’) Major principal stress vs density for various water contents 0.5 g cm’, v = 4.2cm s’) Major principal stress vs density for various water contents (QoI,) 0,6gcmt,v = 0.042 cm s’ Major principal stress vs density for various water contents 0.6 g cm’, v = 0.42 cm s’)
    Location: AWI Archive
    Branch Library: AWI Library
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  • 3
    Call number: ZSP-201-76/5
    In: CRREL Report, 76-5
    Description / Table of Contents: Griffith, and later Babel, have previously developed a tensile fracture criterion for a two-dimensional state of stress. This theory is extended to the compression-compression region. From this theory the angle of fracture is developed. The theory is extended conceptually to three dimensions. Triaxial test data by Haynes for snow-ice are shown in this three-dimensional fracture theory. The test data are slightly less than those predicted when the void in the snow-ice is spherical.
    Type of Medium: Series available for loan
    Pages: iii, 9 Seiten , Illustrationen
    Series Statement: CRREL Report 76-5
    Language: English
    Location: AWI Archive
    Branch Library: AWI Library
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  • 4
    Series available for loan
    Series available for loan
    Hanover, NH : U.S. Army Cold Regions Research and Engineering Laboratory
    Associated volumes
    Call number: ZSP-202-312
    In: Research report
    Description / Table of Contents: CONTENTS: Preface. - Nomenclature. - Introduction. - Test specimen. - Equipment and procedure. - Test chamber. - Error of eccentricity. - Equipment. - Procedure. - Results. - Tensile strength. - Fracture. - Discussion. - Uniaxial tensile strength. - Brazil test. - Comparison with theory. - Conclusions. - Literature cited. - Appendix A. Test results. - Abstract.
    Description / Table of Contents: An investigation was conducted to determine the effect of a compressive stress on the tensile strength of bubbly polycrystalline ice. One hundred forty-five tests were made in an apparatus of novel design. A cylindrical dumbbell specimen was stressed in axial tension and radial and tangential compression by a hydraulic system which minimized bending stresses. Compression-tension ratios ranging from 0.21 to 10.14 were used for the tests. Tensile strength was found to decrease with an increase in the ratio. At the ratio of 3.155 the tensile strength is about one third the uniaxial value. The test results support the evidence that the Brazil test underestimates the tensile strength for ice. They also indicate that the Brazil test value for ice can be no greater than one third the uniaxial tensile strength. A comparison of the experimental results with a few prominent biaxial failure theories indicates a lower tensile strength than predicted by any theory. However, the best approximation to the results is the Coulomb-Mohr criterion.
    Type of Medium: Series available for loan
    Pages: iv, 21 S. : Ill., graph. Darst., Kt.
    Series Statement: Research report / Cold Regions Research and Engineering Laboratory, CRREL, US Army Material Command 312
    Branch Library: AWI Library
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  • 5
    Call number: ZSP-201-83/32
    In: CRREL Report, 83-32
    Description / Table of Contents: Ice forces on a bridge pier in the Ottauquechee River, in Quechee, Vermont, were measured by installing fourpanels-each capable of measuring forces in the normal and tangential direction - on both sides of a vertical V-shaped pier nose. The measured forces are presented for a short period during an ice run. After the ice run, the thickness and sizes of the ice floes were measured and the compressive strength of the ice was determined in the laboratory from the ice samples collected along the river banks. The water level measurements made at several locations along theriver are also presented for the period of the ice run.
    Type of Medium: Series available for loan
    Pages: ii, 8 Seiten , Illustrationen
    Series Statement: CRREL Report 83-32
    Language: English
    Location: AWI Archive
    Branch Library: AWI Library
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