OS-C501

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Offshore Standard DNV-OS-C501, November 2013 Sec.6 Failure mechanisms and design criteria – Page 130 18 Static electricity 18.1 General 18.1.1 Static electricity can develop on composite surfaces, especially if the surrounding air is dry. If the potential electrical sparks created by static electricity can cause a fire, explosion or other hazard the buildup of static electricity shall be prevented. It should be shown that the air is either humid enough that static electricity cannot build up or some conductive surface layer with grounding should be applied. The conductive layer should be applied over all free surface and everything needs to be grounded, ensuring that no ungrounded or unconductive layers are left. 19 Requirements for other design criteria 19.1 General 19.1.1 If a structure or component shows a failure mechanism not described above it may be necessary to describe a design criterion for this failure mechanism. 19.1.2 All design criteria shall be verified against experimental evidence. The model factor assigned to the design criterion shall compensate for the discrepancies between prediction and experiment. The model factor is a deterministic factor. 19.1.3 It shall be confirmed that the design criterion is of general nature and does not just apply to one material or one load case, unless the criterion is only used for that particular condition. 19.1.4 The partial safety factors in the criterion shall calibrated by probabilistic methods to ensure a consistent level of safety with respect to the rest of the standard. DET NORSKE VERITAS AS
Offshore Standard DNV-OS-C501, November 2013 Sec.7 Joints and interfaces – Page 131 1 General 1.1 Introduction SECTION 7 JOINTS AND INTERFACES 1.1.1 Joints and interfaces are special sections or components of a structure. They can in principle be analysed an tested the same way as a structure or component. However, some special considerations are described in the following sections. 1.1.2 Requirements for joints and interfaces are based on achieving the same level of reliability as the structure of which it is part. 1.1.3 If metal components are part of a joint or interface, the metal components shall be designed according to relevant standards for such components. This standard does not cover metal components. 1.2 Joints 1.2.1 Joints are defined here as load bearing connections between structures, components or parts. 1.2.2 Three basic types of joints are considered in this standard: — laminated joints, i.e. joints fabricated from the same constituent materials as the laminates that are joined, such as e.g. over-laminations, lap joints, scarf joints etc. — adhesive joints, i.e. joints between laminates, cores or between laminates and other materials e.g. metals — mechanical joints, i.e. joints including fasteners, e.g. bolted connections. 1.3 Interfaces 1.3.1 Interfaces are defined here as the area or region where different structures, components or parts meet each other. All joints have interfaces. 1.3.2 If the interface shall transfer loads it also has the function of a joint. All requirements for joints apply to such an interface. 1.3.3 A typical interface is the area where the surface of a load bearing structure and a liner meet. 1.4 Thermal properties 1.4.1 The effects of thermal stresses and strains and displacements shall be considered for all joints and interfaces. 1.5 Examples 1.5.1 Examples of good practise shall be evaluated with great care. The examples are usually given for certain load and environmental conditions, without stating those explicitly. The qualification and analysis requirements of this standard shall also be applied joints based on good practise. See also [2.4] on how experience can be utilised. 2 Joints 2.1 Analysis and testing 2.1.1 The same design rules as applied for the rest of the structure shall be applied to joints, as relevant. 2.1.2 Joints are usually difficult to evaluate, because they have complicated stress fields and the material properties at the interfaces are difficult to determine. 2.1.3 Joints may be designed according to three different approaches: — An analytical approach, i.e. the stress/strain levels at all relevant parts of the joint including the interface are determined by means of a stress analyses (e.g. a FEM-analyses) and compared with the relevant data on the mechanical strength. — Design by qualification testing only, i.e. full scale or scaled down samples of the joint are tested under relevant conditions such that the characteristic strength of the complete joint can be determined. — A combination of an analytical approach and testing, i.e. the same approach specified in Sec.10 [3] for updating in combination with full scale component testing. DET NORSKE VERITAS AS
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OS-C501

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