Accession Number:

ADA331271

Title:

Role of Damage and Damage Growth on Dynamic Load Transfer in Particulate Media

Descriptive Note:

Final rept. Jul 93-Aug 97

Corporate Author:

RHODE ISLAND UNIV KINGSTON DEPT OF MECHANICAL ENGINEERING AND APPLIED MECHANICS

Personal Author(s):

• Shukla, Arun
• Sadd, Martin H.

Report Date:

1997-09-30

Pagination or Media Count:

141.0

Abstract:

An experimental study was conducted to investigate dynamic load transfer and wave propagation in particulate assemblies containing damaged particles. The assembly was simulated by a one-dimensional array of circular disks, and the damage itself, by a natural crack or drilled boles. The assembly was explosively loaded and the dynamic load transfer process observed using dynamic photoelasticity and strain gages. Attention was focused on the influence of damage size and orientation on the group wave velocity, wave dispersion, and peak contact load attenuation of the stress wave pulse Damage growth occurring from the interaction of the stress wave with the crack tip was also studied. The results demonstrate that the inclusion of a damaged particle greatly influences the load transfer process, both locally and in the far field. The degree to which the damaged particle modified the load transfer process is more dependent upon the orientation of the crack than upon the size of the crack. Moreover, damage growth within the damaged part ices is also a strong function of the orientation of the crack. Experiments with drilled disks showed that the stress wave propagation was influenced by the amount as well as the orientation of the pores.

Descriptors:

• *WAVE PROPAGATION
• *STRESS WAVES
• DAMAGE
• GROUP VELOCITY
• STRAIN GAGES
• PARTICULATES
• DYNAMIC LOADS
• MEDIA
• PHOTOELASTICITY

Subject Categories:

• Test Facilities, Equipment and Methods
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE