Accession Number:

ADA008396

Title:

The Material Properties of Gelatin Gels

Descriptive Note:

Final rept.

Corporate Author:

MARVALAUD INC WESTMINSTER MD

Personal Author(s):

• Winter, J.
• Shifler, D.

Report Date:

1975-03-01

Pagination or Media Count:

157.0

Abstract:

A collection of physical and mechanical properties have been examined for 20 gelatin gels made from Pharmagel A. Among those parameters measured are density, thermal conductivity, specific heat, specific capacitance, ultrasonic wave velocity, and coefficient of rolling friction. The critical field strength above which electrical properties change radically is documented. An equivalent passive circuit model is proposed. Fracture stress and elastic modulii are measured. Shear stress at fracture and shear modulii are measured. Fracture strains are also documented for many strain rates. The gelatin is examined for piezo-electric effects and electro-optic effects which would modify its stress birefringence by application of an electric field. Surface polarization effects are also examined. The nature of the fracture surface as a function of crack propagation rate is characterized. A visco-elastic transition strain rate is also documented. Finally, changes of density with storage time at fixed temperature and humidity and changes of density with variations in composition are examined.

Descriptors:

• *GELS
• *GELATINS
• DENSITY
• MECHANICAL PROPERTIES
• ELECTRICAL PROPERTIES
• ELECTRICAL CONDUCTIVITY
• FRACTURE(MECHANICS)
• THERMAL CONDUCTIVITY
• FRICTION
• SPECIFIC HEAT
• CAPACITANCE
• ULTRASONIC PROPERTIES

Subject Categories:

• Miscellaneous Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE