ISO INTERNATIONAL STANDARD 12215-5 Second edition 2019-05 Small craft Hull construction and scantlings - Part 5: Design pressures for monohulls, design stresses, scantlings determination Petits navires Construction de coques et échantillonnage - Partie 5: Pressions de conception pour monocoques, contraintes de conception, détermination de I'échantillonnage Reference number ISO 12215-5:2019(E) @ IS0 2019 IS0 12215-5:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2019 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below or Iso's member body in the country of the requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22 749 01 11 Fax: +4122 749 09 47 Email: [email protected] Website: www.iso.org Published in Switzerland i @ IS0 2019 - All rights reserved IS0 12215-5:2019(E) Contents Page Foreword .V Introduction .vii 1 Scope. .1 2 Normative references .2 3 Terms and definitions .2 4 Symbols .4 5 General. 6 5.1 Materials 6 5.2 Overall procedure for scantlings determination .6 6 Main dimensions, data and areas. .7 6.1 Dimensions and data 7 6.2 Areas 7 6.2.1 General 7 7 Dimensions of panels and stiffeners. .9 7.1 General 9 7.2 Rectangular grid of panels and stiffeners. 10 7.3 Non-rectangular panels. 12 7.3.1 Trapezoidal or triangular panels 12 7.3.2 Other shapes. 13 7.4 Pressure on a panel or a stiffener. 14 8 Pressure adjusting factors 15 8.1 General .15 8.2 Design category factor kpc .15 8.3 Dynamic load factor kDYN 15 8.4 Longitudinal pressure distribution factor k 16 8.5 Area pressure reduction factor kAR 17 8.6 Superstructures and deckhouse pressure reduction factor ksup .18 8.7 Pressure correcting factor ksLs for slamming of light and stable sailing craft .18 Design pressures .19 9 9.1 Design pressure for motor craft. 19 9.2 Design pressure for sailing craft. 21 9.3 Watertight bulkheads and integral tank boundaries design pressure 22 9.3.1 General. 22 9.3.2 Integral tanks wash plates. 23 9.3.3 Collision bulkheads .. 23 9.3.4 Non-watertight or partial bulkheads .24 9.3.5 Centreboards of lifting keel wells. 24 9.3.6 Transmission of pillar loads.. 24 9.3.7 Loads from outboard engines. 24 10 Mechanical properties and design stresses .24 10.1 Boat building quality factor kBB. 24 10.2 Assessment method factor kAM . .25 10.3 Design stresses according to material and calculation method 25 11 Methods for structural analysis and scantlings determination 27 11.1 The six available methods. 27 11.2 Method 1: "Simplified" method 27 11.3 Method 2: "Enhanced" method (ply by ply analysis) 28 11.4 Method 3: "Developed" method for any laminate, including non-balanced laminates 28 11.5 Method 4: "Direct test method". 28 11.6 Method 5:"FEM" Finite Element Method. .28 @ IS0 2019 - All rights reserved iii IS0 12215-5:2019(E) 11.6.1 General considerations 28 11.6.2 General guidance for assessment by 3-D numerical procedures. 29 11.6.3 Boundary assumptions and load application 29 11.6.4Model idealisation 29 11.7 Method 6: Alternative test: Drop test 29 11.8 "Good practice" minimal thickness. 30 12 Craft for professional use: Commercial craft and workboats .30 13 Owner's manual 30 13.1 General 30 13.2 Normal mode of operation 30 13.3 Information to take care of sandwich plating 30 13.4 Information required by Annex J for commercial craft and workboats 30 14 Application form 30 Annex A (normative) Application of methods of analysis 1 to 3 of Table 18 .31 Annex B (normative) Mechanical properties and design stress of metals .58 Annex C (normative) FRP laminates properties and calculations .61 Annex D (normative) Drop test for craft <6 m .73 Annex E (normative) Sandwich calculations ..76 An