D Radaj, C M Sonsino and W Pricke Fatigue assessment of welded joints by local approaches Second edition
Foreword Preface Author contact details Introduction 1.1 Fatigue strength assessment of welded joints 1.1.1 Present state of the art 1.1.2 Demands from industrial product development 1.2 Basic aspects of assessment procedures 1.2.1 Multitude of parameters governing fatigue failure 1.2.2 Global and local approaches of fatigue strength assessment 1.2.3 Complications of local approaches for welded joints 1.2.4 Survey of subject arrangement xv xvii xix 1 1 1 2 3 3 5 8 10 2 Nominal stress approach for welded joints 13 2.1 Basic procedures 13 2.1.1 Principles of the nominal stress approach 13 2.1.2 Procedures for welded joints 13 2.2 Analysis tools 16 2.2.1 Books, compendia, guidelines and design codes 16 2.2.2 Basic formulae 16 2.2.3 Permissible stresses and design S-N curves 19 2.2.4 Influence of mean and residual stresses 23 2.2.5 Influence of stress multiaxiality 24 2.2.6 Influence of plate thickness, weid dressing and environment 27
VI Analysis Basic Normalised Fatigue Evaluation Further Definition Hot Endurable Principles Alternative Structural Specific General Contents procedures spot tools strength rules variants survey stress strain of structural stress of definitions S-N - the for hot endurable structural concentration and approach reduction of curves finite spot or structural stress relevant strains stresses element of structural approach hot as factors stress in guidelines proposed weid spot factors modelling stresses for for for 45 28 29 33 40 41 43 44 46 51 57 34 37 48 55 59 61 62 33 45 62 seam-welded structural by the non-tubular root or stress concentration strain strains Xiao- Dong Haibach fatigue evaluation approach joints Yamada stress joints approach factors joints 2.2.7 33
Demonstration Basic Analysis Endurable Welded Notch Fatigue Structural Principles Fictitious Modified Highly General Critical procedures VII tools stressed joints distance tubular bridge survey notch and hot multiaxial structural concentration analysis examples factors in variants spot girder volume rounding joints and based approach ship butt for structures of stresses with -assessment of approach various welded joints the cope factors inotch tubular -procedure joints - the holes strains structural weid of -Dong weid joints 105 125 138 108 126 131 143 145 Contents 101 107 121 62 68 70 73 81 82 84 65 91 94 96and 105 81 91 basic Xiao- non-tubular stress strain root toe refined links weided design fatigue to Yamada approach guidelines procedures joints structural joints approaches stresses 89 91
VIII Basic Design-related Analysis Demonstration Web Tensile Further Assessment Fatigue Principles Peculiarities Welded End-to-shell Stiffener-to-flange Effect Typical Early Comprehensive Special Short-crack Applications Stress Girth Gusseted Laser Comparison Crack Contents Notch procedures stiffener butt application beam relief of propagation strain tools specimen formulae life strength vehicle refinements geometrical shell of welds of behaviour procedure groove with joint the of notch examples approach fillet-welded stress-relieved butt-welded structure basic for frame the exposition of crack notch for with seam-welded of early joint wider unusual approach the of boiler multiaxial weid design containment corner longitudinal propagation strain the at applications Ifor and evaluations section ship loading joints parameters approach of tubular cruciform manufacture seam-welded the press frame joints fatigue with girder types modes joint seam-welded detail ure approach joints corner vessel 212 237 202 206 213 217 221 224 233 235 240 155 158 160 161 163 166 173 214 227 150 152 157 165 180 191 195 199 186 joints 214 202 233 150 166 191joints 233 191 butt-welded residual attachment stresses joints 4.3
Demonstration Analysis General Basic Procedures I-integral Butt-welded Notch General Methods Material Residual Particular Longitudinal Lap Refined Formal Principles Plastic Strain Fatigue Endurable Crack Initial Cruciform Stress procedures joints intensity rise propagation energy shape and stress considerations notch tools IX aspects limit crack analysis survey parameters of stress and final notch corner joints intensity expressed front stress and examples density results propagation variants cover T-joints of effects factors and crack of crack stress transverse presentation of life equations intensity longitudinal notches results relevant of plate for fillet size factors for path of intensity by crack approach corner blunt sharp fillet-welded crack the notch joints welds factor at references for approach notches propagation factors stress forjoints seam-welded 259 242 243 245 247 250 267 268 281 263 271 275 279 286 287 292 296 297 301 308 313 317 319 304 310 307 of Contents 242 296 279 297 313 joints 296 corner intensity determination fillet-welded attachment notches factors joints 7.1
x Subject Method-related Basic Notch Endurable Fatigue Principles Weak Application Link Comparison Crack Significance Contents Structural Local procedures to crack matter points approaches propagation stress test strength theof corner and stress crack hot propagation results of and the of conc1usions fatigue the potential spot investigation analysis assessment crack elastic-plastic strain propagation notch or structural life applied strain terms assessment propagation according concentration notch I-integral strain models and of stress the of based to approach stress energy hot notch a to or seam-welded of on spot approach strain atfor stress 322 366 367 371 372 321 323 336 340 351 355 358 362 343 348spot-welded 334 336 363 366 326 332 345 355 tubular 366 334 joint spot-welded stress strain EU British concentration and weid notch fillet-welded density approach Report similar toe approach measurement strains Standard of fillet-welded joints lap factors similarjoints lap joints 7.3.4
Analysis Demonstration Nominal WeId Elastic-plastic Large Endurable Fatigue Spot-welded Laser Modelling Computation General Structural Buckling Computer spot be deflections tools XI life am survey theory fatigue stress strain forces codes of structural assessment welded - engine axle weid and examples deformation non-linear structural endurable of analysis measurement by suspension decomposition forces spot pillar-to-rocker weid support correlation fatigue stresses supporting resultant welds stress structural and spots weid plate nugget assessment member arm stresses weid subjected of weid weid laser strains spots forces of at car spots stresses at behaviour weid weid spots beam at weid at 400 420 426 429 373 382 388 389 411 427 430 432 376 380 383 392 393 395 398 405 417 evaluation Contents spot to 429 373 393 405 cross-tension connection resultant or body tensile-shear compiled weids at strain spot compi1ed GMA strains spots design patterns weids spots comparison forces bycompiled Maddox Rupp loading by Radaj
XII Basic Analysis Comparative I-integral Principles Weak Early Links Endurable Equivalent Laser Stress General Spot-welded Contents procedures stress beam-welded to points intensity tools survey other and of stress evaluation intensity -notch hat H-shaped cross-tension tensile-shear double-cup the ofnugget fatigue approaches factors the and section stress intensity stress tensile-shear basic factor rotation assessment formulae of specimens approach spot-welded of lap intensity definitions and factors solutions stress joints variants spot-welded and based under intensity with for459 and on461 493 433 436 442 443 483 486 490 501 507 447 453 457 465 467 471 476 510 482 onstress and 433 483 443 471similar 433 large pe structural unequal dissimilar nominal similar application factors lap intensity mixed approach ei-tension joints deflections mode specimens plate structural factors stresses materials relevance specimens conditions thickness stresses
Basic Analysis Limitations Potential Comprehensive Significance, Notch- Fatigue Principles Weak Residual Hardness General Modelling procedures points XIII tools and of assessment survey stress distribution of local examples crack-based local the and limitations modelling distribution approaches notch potential through presented stress, spot-welded examples approaches and of in improved simplified conventional notch crack the by by potential Nykänen crack notch Henrysson Lawrence Sheppard strain joints for 513 517 527 535 542 547 550 551 556 566 518 522 524 531 538 559 ofspot-welded loeal Contents 550 568 570 513 524 576 513 568 579 635 spot-welded approaehes and stress notch strain small-size propagation crack similar stress approach propagation notch joints approach lap approach joints approaches