last modified: 01-MAR-1980 | catalog | categories | new | search |

NESC0715 IMPAC2

IMPAC-2, Dynamic Impact Analysis for 1-D Nonlinear Spring Shipping Container Model

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1. NAME OR DESIGNATION OF PROGRAM:  IMPAC2
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2. COMPUTERS
To submit a request, click below on the link of the version you wish to order. Only liaison officers are authorised to submit online requests. Rules for requesters are available here.
Program name Package id Status Status date
IMPAC-2 NESC0715/01 Tested 01-MAR-1980

Machines used:

Package ID Orig. computer Test computer
NESC0715/01 CDC 7600 CDC 7600
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3. DESCRIPTION OF PROBLEM OR FUNCTION

IMPAC2 solves the equations of  motion for a one-dimensional, lumped-mass, nonlinear spring mathematical container model. The program was designed to analyze the dynamic response of metallic shipping containers impacting an unyielding surface. The container may consist of several hollow concentric cylinders, each of a different material and length.
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4. METHOD OF SOLUTION

An iteration technique (Newmark-Beta) is used to solve the equations of motion for displacement, velocity, and acceleration of the masses at each time-step.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

The maximum number of masses is 100. The program is written for a maximum of 10 different materials. The first seven have been given the following designations:
   1  steel
   2  clad lead
   3  uranium
   4  pine
   5  lead
   6  balsa
   7  marine plywood
Stress-strain characteristics for materials 1, 3, 4, and 6 are approximated by a bilinear curve fit which requires as input the modulus of elasticity, the stress at the intersection of the two lines and the slope of the second line.
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6. TYPICAL RUNNING TIME

The sample problem took less than 2 minutes of CDC7600 time.
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7. UNUSUAL FEATURES OF THE PROGRAM

The input is specifically written  to accommodate shipping container geometry and requires only overall dimensions, rather than the dimensions of each mass and spring.
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8. RELATED AND AUXILIARY PROGRAMS:
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9. STATUS
Package ID Status date Status
NESC0715/01 01-MAR-1980 Tested at NEADB
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10. REFERENCES

J.  Counts and  J.  B.  Payne, IMPAC2--A  Lumped-Mass
Nonlinear  Spring Computer  Program  to  Analyze Type  B  Shipping
Container Impact Problems, LA-6643-MS, January 1977.
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11. MACHINE REQUIREMENTS:  CDC7600 with card input and printer.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC0715/01 FORTRAN-IV
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  LASL CROS Operating System and CDC SCOPE.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHORS

                 J. B. Payne, MS 312
                 Los Alamos Scientific Laboratory
                 P. O. Box 1663
                 Los Alamos, New Mexico  87545
                 J. Counts
                 Division of Environmental Control Technology
                 U. S. Department of Energy
                 Washington, D.C.  20545
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16. MATERIAL AVAILABLE
NESC0715/01
File name File description Records
NESC0715_01.001 SOURCE 1012
NESC0715_01.002 INPUT FOR S.P. 7
NESC0715_01.003 OUTPUT OF S.P. 251
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17. CATEGORIES
  • I. Deformation and Stress Distributions, Structural Analysis and Engineering Design Studies

Keywords: containers, equations of motion, impact shock, stresses.