Accession Number:

AD0711555

Title:

THE EFFECT OF AIRDROP IMPACT ON COMPLEX STRUCTURES

Descriptive Note:

Final rept. Aug 1967-Dec 1969

Corporate Author:

TEXAS UNIV AT AUSTIN ENGINEERING MECHANICS RESEARCH LAB

Personal Author(s):

• Jan, Song Fong
• Ripperger, E. A.

Report Date:

1969-12-01

Pagination or Media Count:

49.0

Abstract:

The accelerations and displacements in a complex structure subjected to an impact loading are computed by treating the structure as a lumped parameter system. A mathematical model of the system consists basically of discrete masses linked by weightless, elastic beams with the appropriate stiffnesses, areas, and moment of inertia properties. By specifying a proper set of independent coordinates through which the motion of these lumped masses are uniquely described, and by writing equations of motion in terms of these coordinates, a set of equations is derived which represents the motion of any part of the model during impact. Using the Runge-Kutta numerical method, and a digital computer, these equations are solved. A physical model of the lumped parameter system was built and cusioned with paper honeycomb. Displacements and accelerations at some points in this model were measured and compared with computed results. Agreement is satisfactory.

Descriptors:

• *AIR DROP OPERATIONS
• *LANDING IMPACT
• COMPUTER PROGRAMS
• EQUATIONS OF MOTION
• FLOW CHARTING
• NUMERICAL ANALYSIS
• SHOCK(MECHANICS)
• STRESSES

Subject Categories:

• Military Operations, Strategy and Tactics
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE