- 积分
- 4
- 注册时间
- 2007-12-2
- 仿真币
-
- 最后登录
- 1970-1-1
|
发表于 2011-4-24 22:46:26
|
显示全部楼层
来自 黑龙江哈尔滨
6.10 Aircraft Engine Mounting Lug FE Based Fatigue Analysis 751 c/ U. V+ X5 C1 {
6.10.1 S-N Analysis 75
; {2 L1 w }: u6.10.2 Crack Growth Prediction 77; s7 e/ J1 S, o. P. U x0 |) }
6.11 FE Hints and Tips – Crack Growth 79+ I: `: I2 o. M2 l: g4 a+ g5 E
6.11.1 The Use of Crack Tip Elements 791 w! P# \2 ^* l; U
6.11.2 Picking a Nominal Stress 79, ?/ X0 t/ w- y" ]$ y8 Z
7 Multi-axial Fatigue Analysis. 81
3 g- i$ E$ S7 z& }8 @7.1 Multi-axial Stress-Strain States 81
& A3 Y# T2 K& F& o7.1.1 Separate Tensile and Torsion Loading 820 B- f& X1 o" v) f8 Y
7.1.2 Combined Tensile and Torsional Loading 84% C! l+ U+ X8 z+ O
7.2 Characterisation of Stress States 844 ]1 k& X9 i; v) e' g
7.3 Proportional Multi-axial Responses 877 w/ Y, @' l. n2 ~
7.4 Equivalent Stress-Strain Approaches 89
$ P: n$ m& K a1 }9 }0 U3 L7.5 Dealing with Non-Proportional Responses 90. Q4 Y0 C. g9 H F: U* D5 @
7.6 FE Hints and Tips – Multi Axial Fatigue 923 {) h0 ^7 e& X! A* ?! z# n
7.6.1 3D, 2D and 1D Models 92/ x e( W# I: d& z
7.6.2 Multi Modal Response to Single Input Loading 92
; |, |. C, z! k+ J7.6.3 Summary 92
: i; F5 D4 N7 w5 W: V8 Vibration Fatigue Analysis. 939 l( ], U8 K: m& _ l
8.1 Alternative Descriptions of Engineering Processes 93
# S0 d1 ~6 l. } f8.1.1 What is the Frequency Domain? 95
6 _: ]* F* Z2 W o2 o8.1.2 What is a Power Spectral Density (PSD)? 96) B4 x& H3 J# w% N! @5 O& V
8.2 Characterization of Engineering Processes Using Statistical Measures 96
J" A. Z+ c( N" x8.2.1 Time Histories & PSDs 96
4 |; U) r. `2 W$ O. h4 v8.2.2 Expected Zeros, Peaks and Irregularity Factor 97) q/ Q; ]- h" i G5 ~
8.2.3 Moments From a PSD 98! g6 M! t- C1 M( c7 n4 |
8.2.4 Expected Zeros, Peaks and Irregularity Factor From a PSD. 991 P% c+ P! }* O
8.2.5 What is The Transfer Function? 99
& C' F' S" C8 ]$ Q9 M) s8.3 What is a Modal Transient (Superposition) Fatigue Analysis? 101" c5 n3 v3 h# y9 j. ?
8.4 Fatigue Life Estimation From PSDs 102
' Z$ h. D- e. Z" C8.4.1 Time Domain Stress-Life Fatigue Life Estimation 102
4 g4 h& e F5 t, F i- N8.4.2 S-N Relationship 1033 F" Q: B0 m1 H0 x8 L* h! }
8.4.3 Estimating Fatigue Life From a Stress pdf 103
5 \ r, T" g4 c% o7 ~8.4.4 The Frequency Domain Model 103
# S" T4 W3 R. t6 |& g2 E/ v8.4.5 Narrow Band Solution 1045 l5 h8 `1 Z( O6 Y9 T4 y
8.4.6 Empirical Correction Factors (Tunna, Wirsching, Hancock, Chaudhury1 [/ w: S% R0 R2 p# J- A- r
and Dover) 1065 c& J% {9 w) `& f" w' H/ Z% U& x8 ~
8.4.7 Dirlik’s Empirical Solution for Rainflow Ranges 106
- V8 o0 R* H) |8.4.8 Bishop’s Theoretical Solution for Rainflow Ranges 107
& a( K- O* d* y# p4 t% F: \4 C8.4.9 Clipping Ratio as a Function of rms 107$ V- J* Q1 ~- y/ k B' M
8.5 A Simple Vibration Fatigue Hand Calculation 107% }; H% v8 }& U/ v* b1 J( T( c, D
8.5.1 Time Domain By Hand. 108
! l+ p* r' C d y; C; h) M8.5.2 Frequency Domain By Hand. 109! q7 D+ H) T! g+ j3 M; V, w/ m9 W. o
8.5.3 Computer Based Calculations Using MSC.Fatigue 109
( |& A3 F- H7 k8.6 An FEA Based Example 1102 D! f% B' q! | g6 M* r4 p6 a6 K9 W
8.7 FE Hints and Tips – Vibration Fatigue 1109 k* |$ o4 k2 X6 u0 u
8.7.1 Calculation of Frequency Response Function (Transfer Function) 1108 b9 W6 i4 V% b: R) x5 g
8.7.2 Verifying Vibration Fatigue Results 112 B9 a$ }8 \# H0 j6 f
9 FE Model Building and Post Processing Issues. 113
3 x; m: I' F+ Y) Z4 f9.1 Introduction 113
. A5 l/ h b, B9.2 Process Issues 113
# k" U, f. c" m3 ^9.3 Model Building 117
0 D$ p/ e$ R r6 L; u, D6 i9.3.1 Requirements 117
; K0 r+ d+ `: h$ J; i) [6 s6 ]9.3.2 Observations 118, u7 U2 {% `7 D3 B+ y% w
9.3.3 H vs P-type element choice 119
! l' K' R9 b/ Y2 s+ l" K8 c# y# T9.4 Meshing 120$ Q+ B5 _7 a* Q3 W& _9 B. Y7 J
9.5 Dealing with Loads. 1204 s5 ~$ r3 d9 s* {( L: z
9.6 FEA Based Global Analysis Options 121
* N; y8 o8 L7 T0 ~* ~/ {& i9 s9.6.1 Analysis Options 1211 ^9 }0 w8 b) o
9.6.2 FE Results output type 1238 j7 Z1 W8 K2 c0 V' B" A
9.7 FE Based Local Analysis Options 123
. b2 ^/ q3 J6 v0 x* m9.7.1 What is “Absolute Maximum Principal” Stress and “Signed Von Mises”?/ S$ A- K; a* z; E4 w
1238 a; o, U, e0 R, D. h" I- o. `
9.7.2 The Choice of Element Centroid Versus Nodal Results 124
8 N* u7 l) r3 [! \9.8 Pre Processing of Loading Data 125* G ]4 _& b' z+ o& M% y" K+ A9 V
9.9 Post Processing of FE Based Fatigue Results. 1251 ~2 e h# h' Y7 ~6 y
9.10 Accuracy of Fatigue Life Estimates 127
& n: x O1 o- V0 [2 B4 P( H2 n9.11 General Conclusions 128
/ \$ R" a9 z- j* c10 Bibliography 129 |
|