9 the user will input a nonstandard KR table with “NP" data points.
(6) "LDPI " is used for the KR table "NP" = 9 and for "NP” = 4 (see remark 8).
(7) The theory on how the KR curves are used to calculate internal beam loads is
shown in Volume I. Section 1.3.5.3.4. (Reference I).
(8) Foi "NP" = 4 the LDP value represents the deflection value at which KR = I.
(LINEAR). LDPI icprescnts KR value (< I). 0 <_ deflection <_ LDP.
NP = 4 can he iiselul I'm modeling elements such as a seat cushion which is
soil miiialK and stiltens during compression. Do not use with LDPI > 1.0
(9) I'm mat tm i ho , ai d n ( 2 (12. 13 i 2L S . 2EI 0.0).
MAX LOAD
LDP IS THE DEFLECTION AT WHICH PEAK
LOAD OCCURS
h I KR = 0.0
NP = 5 THROUGH 9
NP = 5
V \
1 NP = 6
NP = 7
NP = 8
3LDP 4 LDP
DEFLECTION, INCHES OR RADIANS
DEFLECTION, INCHES OR RADIANS
FIGURE 2-6. STANDARD NONLINEAR BEAM ELEMENT STIFFNESS
REDUCTION CURVES
KRASH INPUT DATA
CARDS 1900: NON-STANDARD KR TABLE DATA POINTS
DESCRIPTION Defines non-standard KR tables for the nonlinear beam elements in the KRASH model
~~ which cannot be described with the standard KR tables.
FORMAT AND EXAMPLE:
- —— --- - --
0 1 2 3 4 5 6 7
I 2 34 56 7*901234 56~X90I 2345678901234 56 78901234 567X9012345678901234567890123456789
XKR
KR
x
:>c
x:
►:<
1.0
-1.0
□
1900
a v a
FIELD CONTENTS
XKR Deflection - Inches
KR Stiffness Reduction Factor at XKR
REMARKS
(1) Optional data cards.
(2) Fo: each use of "NP" > 9 on the 1 200-series cards. “NP" of these cards are
required input.
(3) Blank entries are read as zero.
(4) Within each set of "NP" data cards, deflections must be in ascending order.
(5) Each set of "NP" data cards must be ordered to correspond with the 1800 series
cards where "NP" > 9 js used.
(6) Format for this card is 2E10.0.
X ©
KRASH INPUT DATA
CARD 2000: CONTROL VOLUMt MASS PENETRATION PARAMETERS
DESCRIPTION : Defines a control volume around a selected mass point in the KRASH model which is
monitored for penetration by another mass point during the analysis.
FORMAT AND EXAMPLE
0 1
->
3
4
S
6
7
8
12345678901234567890123456789012345678901234S67890123456789012345678901234567890
XN
XP
YN
YP
ZN
ZP
x
0
10 0
10.0
3.0
4.0
10.5
1.9
□
2000
FIELD
CONTENTS
XN
Distance From Mass Point To
XP
Distance From Mass Point To
YN
Distance From Mass Point To
YP
Distance From Mass Point To
ZN
Distance From Mass Point To
ZP .
Distance From Mass Point To
REMARKS
(1) Optional data card.
(2) ‘MVP” on card 0040 specifies the mass point number for which this data card applies.
(3) Only one mass point may have a control volume.
(4) Blank entries are read as zero.
(5) All distances are positive and units are inches.
(6) For a RUNMOD = 2 the MVP mass should be selected from a mass point located on
the airplane centerline. This restriction doesn’t apply to RUNMOD = 0 or 1.
(7) Any of the model mass points may penetrate the designated control volume of the model.
(8) The mass penetration calculations are described in Volume I, Section 1.3.10.
(9) Format for this card is 6E 10.0.
2-63
KRASH INPUT DATA
CARD 2100 : DRI ELEMENT SPECIFICATION
DESCRIPTION: Defines the end mass points of the DRI beam elements in the KRASH model.
FORMAT AND EXAMPLE:
1 0
1
2
3
4
5
6
7
8
1 12345678901234567890123456789012345678901234567890123456789012345678901234567890
11
Jl
m
J2
13
J3
14
J4
15
J5
16
J6
17
J7
6
3
U
2100
FIELD CONTENTS
II Mass Point Number At End “I"
JI Mass Point Number At End “J”
REMARKS:
(1) Optional data card(s).
(2) "NDRI" on card 0040 specifies the number of these cards for input.
(3) All entries are right justified integers.
(4) Blank entries are read as zero.
(5) Up to seven DRI beam elements can be specified on each card. (Normally an analysis
requires from 1 to 4 DRI elements).
(6) DRI beam element section properties can be defined on the 0900-series cards or if a
MTL code of 10 is used the program will automatically compute the DRI properties.
(7) Beams that connect massless node points cannot be used as DRI elements, only
direct mass to mass connection is allowed.
(8) The usage of DRI elements is described in Volume I, Section 1.3.12.
(9) Format for this card is 1415.
i
i
2-64
KRASH INPUT DATA
CARD 2200 : OCCUPIABLE VOLUME CHANGE PARAMETERS
DESCRIPTION : Defines occupiable volumes in the KRASH model for volume change calculations by
specifying the eight corner mass points.
FORMAT AND EXAMPLE:
01 2345678
1234567890123456789012345678901234S678901234567890123456789012345678901234567890
11
12
13
74
15
16
17
18
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r* O >0 »■«
N >f ^ N f^<-»U>{V't'TU1^fJ00O'lfl<
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FIGURE 2-10. MISCELLANEOUS CALCULATED DATA (SHEET
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