aluminium in commercial vehicles - European Aluminium Association

More documents

Recommendations

Info

78 EUROPEAN ALUMINIUM ASSOCIATION ALUMINIUM IN COMMERCIAL VEHICLES CHAPTER VI The properties of the parent material have very little influence on the fatigue strength in practi- cal structures and components. For connections the properties of the parent material have no S Δσ Δσ C Δσ D Δσ L 2) 1) Number of cycles (108 ) at which the cut-off limit is defined 2) For low cycles fatigue, this part of the curve may not be cor- 1 b influence at all. For a plate or extrusion with no manufacturing or only holes and notches the standard deviate between EN AW 7020 and all other structural alloys. ‰ m 1 a N C FIGURE VI.14 . e 10‰2 ‰ rect, other calculation methods are recommended (Annex F of EN 1999-1-3). It shall be checked that the maximum design stress The fatigue strength is given as SN curves for the different details. All detail categories given in EN 1999-1-3 have their own SN curve. A typical SN curve is shown on the Figure VI.14. 104 105 106 107 108 109 N 1 m 2 5 . 10 e N D a. Fatigue strength curve b. Reference fatigue strength c. Constant amplitude fatigue limit d. Cut-off limit N L c 1) d range don’t result in a tensile stress exceeding the design stress in ultimate limit state.
EUROPEAN ALUMINIUM ASSOCIATION ALUMINIUM IN COMMERCIAL VEHICLES CHAPTER VI 79 The stress ratio, R, is the mini- mum stress divided by the maximum stress in a constant amplitude stress history or a cycle derived from a variable amplitude stress history. Favourable stress ratio will enhance the fatigue strength for some cases compared with the values given in the standard. For initiation sites in base material away from connections, there will be an increase in the fatigue strength for R < +0.5. For initiation site at welded or mechanical fastened connections in simple structural 5.3 45-4,3 elements, where the residual stresses has been established, taking into account any preaction or lack of fit, there will be an increase in the fatigue strength for R < -0.25. For other cases there will be no change from the values in the standard. Some typical details categories are shown in the Table VI.6. The first row in the table gives the detail type number, the second row gives the detail category, the third gives a sketch of the detail and also showing the initiation site and the direction of the TABLE VI.6 stress, the fourth gives the weld type, the fifth gives the stress parameter, the sixth gives the welding characteristics, the seventh gives the quality level for the internal imperfections and the eight gives the quality level for the surface and geometrical imperfections. The requirements for the quality levels are found in EN ISO 10042 and additional requirements are given in EN 1090-3. 5.1 63-4,3 Δσ Full penetration butt weld Weld caps ground Continuous automatic welding B C 5.2 56-4,3 Δσ flush C C At weld discontinuity ‰ ‰ ‰ ‰ Δσ ‰ ‰ ‰ ‰ ‰ ‰ ‰ ‰ Δσ At weld discontinuity Full penetration butt weld Any backing bars to be continuous 5.4 45-4,3 B C Continuous fillet weld 5.5 40-4,3 Δσ Δσ C D At weld discontinuity ‰ ‰ ‰ ‰ ‰ ‰ Nominal stress at initiation site C D
Page 1 and 2:
ALUMINIUM IN COMMERCIAL VEHICLES
Page 3 and 4:
Aluminium in Commercial Vehicles ha
Page 5 and 6:
VII. FABRICATION . . . . . . . . .
Page 7 and 8:
CHAPTER II ALUMINIUM IN TRANSPORT 1
Page 9 and 10:
EUROPEAN ALUMINIUM ASSOCIATION ALUM
Page 11 and 12:
Page 13 and 14:
Page 15 and 16:
CHAPTER III WHY USING ALUMINIUM 1.
Page 17 and 18:
Page 19 and 20:
Page 21 and 22:
Page 23 and 24:
Page 25 and 26:
Page 27 and 28: EUROPEAN ALUMINIUM ASSOCIATION ALUM
Page 29 and 30: CHAPTER IV FREQUENTLY ASKED QUESTIO
Page 39 and 40: CHAPTER V ALUMINIUM ALLOYS FOR COMM
Page 57 and 58: CHAPTER VI DESIGN AND CALCULATION 1
Page 77: EUROPEAN ALUMINIUM ASSOCIATION ALUM
Page 91 and 92: CHAPTER VII FABRICATION 1. INTRODUC
Page 107 and 108: CHAPTER VIII WELDING 1. FOREWORD .
Page 129 and 130:
CHAPTER IX OTHER JOINING TECHNIQUES
Page 131 and 132:
Page 133 and 134:
Page 135 and 136:
Page 137 and 138:
CHAPTER X DECORATION AND FINISHING
Page 139 and 140:
Page 141 and 142:
Cell wall EUROPEAN ALUMINIUM ASSOCI
Page 143 and 144:
Page 145 and 146:
CHAPTER XI CORROSION RESISTANCE 1.
Page 147 and 148:
Page 149 and 150:
Page 151 and 152:
Page 153 and 154:
CHAPTER XII CLEANING OF ALUMINIUM C
Page 155 and 156:
Page 157 and 158:
CHAPTER XIII REPAIR OF ALUMINIUM CO
Page 159 and 160:
Page 161 and 162:
show all

aluminium in commercial vehicles - European Aluminium Association

Create successful ePaper yourself

Delete template?

Save as template?