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AJ55TB2-16D 1、避免疲勞失效

產品出現不應當發生的疲勞失效會使企業的信譽受損，經濟損失更大！

2、避免過大余量的設計

過大余量設計使得產品的成本增加，市場競爭力下降！

3、考慮了時間變量，比強度計算獲得更加符合實際的結構失效位置。

下面給大家介紹一下常用的疲勞設計方法：

一、無限壽命設計(Infinite-life design)

對于疲勞，應力幅比構件承受的應力更重要。應力幅越大，疲勞壽命越短；應力幅小于某一極限值時，將不發生疲勞破壞。

對于無裂紋構件，控制其應力水平，使其小于疲勞極限強度，則不萌生疲勞裂紋。于是，無限壽命設計條件為：

S

材料的疲勞持久極限Sf由S-N曲線給出，如圖1所示，對于該圖的疲勞極限強度為86.2MPa。

圖1 材料的S-N數據列表

對于需要經歷無限次循環（1e6 次）的零、構件，如發動機氣缸閥門、頂桿、彈簧，長期頻繁運行的輪軸等，無限壽命設計至今仍是一種簡單而合理的方法。

對于存在初始裂紋構件，控制應力強度因子水平，使其小于一個門檻值，則雖有裂紋但不擴展，也可實現無限壽命設計。

二、安全壽命設計(Safe-life design)

無限壽命設計要求將構件中的使用應力控制在很低的水平，材料的潛力得不到充分發揮，對于并不需要經受很多循環次數的構件，無限壽命設計就很不經濟。

使構件在有限長設計壽命內，不發生疲勞破壞的設計，稱為安全壽命設計或有限壽命設計。民用飛機，容器，管道，汽車等，大都采用安全壽命設計。

材料S-N曲線和Miner累積損傷理論，是安全壽命設計的基礎。當然，考慮到疲勞破壞的分散性等不確定因素，安全壽命設計應當具有足夠的安全儲備。

AJ55TB2-16D 
Allen Bradley Cat # 1745-LP101 Processor Unit *NIB*

ALLEN BRADLEY AB 1745-PT1 SLC100 PLC PROGRAMMER - NEW

ALLEN BRADLEY SLC 100 PLC, CAT. 1745-LP101,USED

Allen Bradley 1745-C2/1745C2 Ribbon interconnect

Allen-Bradley 1745-M1 1745M1 ser B New IN BoX 

ALLEN BRADLEY 1745-LP101 SERIES D SLC100 PROCESSOR UNIT

ALLEN BRADLEY 1745-E105 USED 1745E105

Allen Bradley Memory Module 1745-M1 1745M1 New! QTY = 2

ALLEN BRADLEY 1745-C2 RIBBON CABLE

Allen-Bradley 1745-E156 EXPANSION MODULE SLC 150 Ser. A

Allen Bradley SLC100 PLC 1745-E105

ALLEN BRADLEY 1745-C1 SER. B CABLE NEW 1745C1

ALLEN-BRADLEY 1745-LP153 SLC 150 Processor Unit ! WOW !

Allen-Bradley 1745-E105/C SLC 100 Relay Expansion Unit

Allen Bradley 1745-LP153 Processor Unit 1745LP153 New

NS** ALLEN-BRADLEY 1745-E153 SLC 150 EXPANSION UNIT

Allen-Bradley SLC-100 PLC 1745-E101 Ser A NIB WARRANTY!

Allen Bradley 1745-E151 SLC Expansion Unit #21209

Allen Bradley 1745-E151 SLC Expansion Unit #21213

Allen Bradley 1745-E151 SLC Expansion Unit #21210

ALLEN BRADLEY 1745-E101 SERIES A SLC100 EXPANSION I/O

Allen Bradley 1745-E151 SLC Expansion Unit #21214

NEW ALLEN BRADLEY 1745-E106 PROGRAMMABLE CONTROLLER

ALLEN BRADLEY 1745-M1 MEMORY MODULE NEW IN BOX

ALLEN-BRADLEY 1745-E106 SLC 100 Programmable Controller

ALLEN BRADLEY 1745-B1 NEW IN THE FACTORY BOX 

ALLEN BRADLEY 1745-M1 USPP 1745M1

ALLEN BRADLEY 1745-E101 SERIES B SLC100 EXPANSION I/O

Allen Bradley book Bulletin 1745 SLC Programmable Cont.

Allen Bradley book Bulletin 1745 SLC Programmable Cont.

ALLEN BRADLEY 1745-C3 NSPP 1745C3

Allen Bradley SLC100 1745-E105 Ser.C Expansion Unit

ALLEN BRADLEY 1745-C2 USPP 1745C2

ALLEN BRADLEY 1745-C2 NSPP 1745C2

ALLEN BRADLEY 1745-R3 NSFP 1745R3

ALLEN BRADLEY SLC 100 EXPANSION UNIT 1745-E101 SERIES A

ALLEN BRADLEY 1745-LP154 USPP 1745LP154

ALLEN BRADLEY 1745-E101 USPP 1745E101

Allen Bradley 1745-PTI Pocket Programable Controller

AB SLC150 1745-LP151 Ser C FRN6 Allen Bradley Prog. Co

Allen-Bradley SLC 150 1745-LP151 Processor Unit 

ALLEN BRADLEY 1745-E153 SER. A EXPANSION 1745E153 NIB

Allen Bradley SLC100 1745-E105 Series B Expansion Unit

Allen Bradley 1745-LP153 SLC 150 Processor Unit

ALLEN BRADLEY 1745-LP101 SLC 100 PROGRAMMABLE CONT*XLNT

ALLEN BRADLEY 1745-E151 SER A

Allen Bradley SLC100 1745-E101 Series B Expansion Unit

ALLEN BRADLEY 1745-E151 SER B

ALLEN BRADLEY 1745-C1 PROCESSOR/PROGRAMMER CABLE 1745C1

Allen-Bradley 1745-E101X I/O PLC 1745E101X WARRANTY!

Allen Bradley Interface Programing Module # 1745-TCAT

ALLEN BRADLEY 1745-M1 B MEMORY MODULE ***NIB***

ALLEN BRADLEY 1745-LP101 SLC 100 PROCESSOR UNIT

ALLEN-BRADLEY 1745-E151 SLC 150 Expansion Unit ! WOW !

ALLEN BRADLEY SLC 100 1745-LP103 PROCESSOR CONTROLLER

ALLEN BRADLEY 1745-E151/A SLC 150 EXPANSION MODULE*NNB*

Allen Bradley Memory Module 1745-M1 1745M1 Ser B

ALLEN BRADLEY AB 1745-E151 SLC 150 EXPANSION UNIT w/CAB

ALLEN BRADLEY 1745-LP101 PROGRAMMABLE CONTROLLER - NIB

1745-E103 EXPANSION UNIT

ALLEN BRADLEY PROGRAMMABLE CONTROLLER 1745-E101 *NICE*

Allen-Bradley 1745-E155 PLC 1745E155 WARRANTY!!

1745-LP153 Allen Bradley SLC 150 1745LP153 N835

NEW ALLEN BRADLEY 1745-LP151 SERIES C

Allen-Bradley 1745-E104 EXPANSION I/O Ref WARRANTY

1745-LP101 Allen Bradley SLC 100 Exp Unit 1745LP101

Allen Bradley Battery 1745-B1 For SLC-100 

New Allen Bradley Memory Module 1745-M1 1745M1 Ser B

Allen-Bradley 1745-E105 EXPANSION UNIT RELAY SLC100

Allen Bradley #1745-LP101 I/O Module Fixed (U) ABS/9

Allen Bradley SLC150 Expansion Unit 1745-E153 Series A

1745-B1 Battery for ALLEN BRADLEY 1745-LP15 1745-LP152

Allen-Bradley 1745-E153 PLC 1745E153 WARRANTY!

ALLEN BRADLEY EXPANSION MODULE FOR SLC 150~ 1745-E151~

New in Box 1745-LP153/C Allen Bradley SLC 150 1745LP153

ALLEN BRADLEY AB 1745-E105 RELAY OUTPUT EXPANSION UNIT

New in Box 1745-LP153/C Allen Bradley SLC 150 1745LP153

Allen Bradley SLC 100 Expansion Unit M# 1745-E101 ~NIB~

1745-E101 Allen Bradley SLC 100 Expansion Unit 1745E101

Allen-Bradley 1745-E101 PLC 1745E101 NEW! WARRANTY!!

Allen Bradley 1745-LP151 SER C FRN6

Used Allen Bradley, 1745-E153 SLC150 Expansion Unit

Allen Bradley 1745-LP101 SER D

Allen-Bradley 1745-R2 1745R2 PLC WARRANTY NEW NIB

ALLEN BRADLEY 1745-LP151 USPP 1745LP151

ALLEN BRADLEY 1745-LP103 USPP 1745LP103

ALLEN BRADLEY 1745-800 USPP 1745800

ALLEN BRADLEY 1745-850 USPP 1745850

ALLEN BRADLEY 1745-C1 NSFP 1745C1

ALLEN BRADLEY 1745-B1 NSPP 1745B1

ALLEN BRADLEY 1745-LP153 NSPP 1745LP153

ALLEN BRADLEY 1745-PCC USPP 1745PCC

ALLEN BRADLEY 1745-E153 NSPP 1745E153

Allen-Bradley 1745-PT1 with cable

ALLEN BRADLEY A-B 1745-C3 CABLE 1745C3

Allen Bradley # 1745-R1 programmable controller SLC 100

Allen Bradley SLC 150 Expansion Unit 1745-E151, Ser A

Allen Bradley SLC 100 1745 E105 Programmable Controller

ALLEN BRADLEY 1745-M1 B MEMORY MODULE ***NIB***

Allen Bradley 1745-R1 Replacement Relay Board 1745R1

Allen Bradley SLC150 PLC 1745-LP151

Allen Bradley H.S. input Module 1745-E155 Used

Allen Bradley 1745-E105 Expansion Unit AB SLC 100 

Allen Bradley Cable 1745-C3 NEW __B92

Allen Bradley SLC 100 Expansion Unit 1745-E101

ALLEN BRADLEY 1745-M1 MEMORY MODULE NEW IN BOX

ALLEN BRADLEY SLC 100 PROCESSOR 1745-LP101 SERIES D 

Allen Bradley 1745-LP156 SLC 150 Processor #21205

Allen Bradley 1745-PT1/1745PT1 NEW!!!!!

Allen Bradley 1745-TCAT/1745TCAT

1745-LP101/D Allen Bradley SLC 100 PLC 1745LP101 N840

Allen Bradley SLC 100 Relay Output Exp. Unit 1745-E105

ALLEN BRADLEY SLC100 PROGRAMMABLE CONTROLLER 1745-E101

ALLEN BRADLEY SLC100 PROGRAMMABLE CONTROLLER 1745-E101

New in Box 1745-LP156/C Allen Bradley SLC 150 1745LP156

Allen Bradley Interface Converter 1745-PCC & 1745-C1

AJ55TB2-16D