OS-C501

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Offshore Standard DNV-OS-C501, November 2013 Sec.13 Definitions, abbreviations & figures – Page 178 Table 13-1 Terms (Continued) Open beam a sandwich beam is defined as an open beam if it has face material on 2 sides only Operator the party, which assumes ultimate responsibility for the operation and maintenance of the System. The Operator may or may not be the same as the Principal or Principal’s agent Orthotropic having three mutually perpendicular planes of material symmetry. Owner person who is understood to be the operative owner of the System (same as client?) Part a component can be divided into parts Partial Factor partial factors are assigned to basic variables in order to take into account their inherent uncertainties or systematic errors. Phase well-defined period within the lifespan of a structure. Ply basic building block of a laminate with orthotropic properties. Layer of reinforcement surrounded by a matrix. Principal the party, which initiates the project and ultimately pays for its design and construction. The Principal will generally specify the technical requirements. The Principal is ultimately responsible for ensuring that safety and all other issues are addressed. The Principal may also include an agent or consultant, authorised to act for the Principal. Reinforcement a strong material embedded into a matrix to improve its strength, stiffness and impact resistance. Reliability ability of a structural component or system to perform its required function without failure during a specified time interval. The reliability is expressed as a probability, sometimes denoted the probability of survival, and can be determined as the probability density integrated over the safe states in the space spanned by the governing stochastic variables. The reliability is the complement of the failure probability. Resistance factor partial safety factor by which the characteristic strength is divided to obtain the design strength, in other literature often termed as Material Factor. Resistance capability of a structure or part of a structure, to resist load effects. Risk the quantified probability of a defined failure mode multiplied by its quantified consequence. Roving a number of strands, tows, or ends collected into a parallel bundle with little or no twist. Sandwich Structure a structural sandwich is a special form of a laminated composite comprising of a combination of different materials that are bonded to each other so as to utilise the properties of each separate component to the structural advantage of the whole assembly. Strand normally a untwisted bundle or assembly of continuous filaments used as a unit, including slivers. twos, ends, yarn and so forth, Sometimes a single filament is called a strand. Structure general word for system, component, or detail, i.e. when the distinction of size and location is not important. Stacking sequence a description of the orientation of plies in a laminate. System an assembly consisting of a range of components, connections, attachments, etc. Warp the direction along which yarn is orientated longitudinally in a fabric and perpendicularly to the fill yarn. Weft the transversal threads of fibres in a woven fabric running perpendicular to the warp. DET NORSKE VERITAS AS
Offshore Standard DNV-OS-C501, November 2013 Sec.13 Definitions, abbreviations & figures – Page 179 2 Symbols and abbreviations Table 13-2 Definitions of symbols for variables Variables 1,2,3 : ply, laminate, or core local co-ordinate system, 1 being the main direction a : half crack length a i : scalar A i,j : matrix A components [A] : extensional stiffness matrix b : width b’ : horizontal distance between faces NA for boxed beam C : swelling agent concentration coefficient COV : coefficient of variation d : vertical distance between faces neutral axis (NA) D : flexural rigidity D 0 : flexural rigidity of faces about the NA of the entire sandwich structure e : core width {e} : expansional strain field E : modulus of elasticity e i : general expansional strain f : correction factor - scalar G : shear modulus : strain energy release rate h H I k K l m M N Q i,j [Q] R S SCF S i,j [S] t T U u,v,w V x,y,z Φ Ψ α α β ε εˆ {ε} γ γ F : height of boxed beam : anisotropy factor : 2 nd moment of area : scalar : stress intensity factor : length : surface mass : moment : in-plane load : matrix Q components : stiffness matrix : resistance : shear stiffness, local or global structure response : stress concentration factor : matrix S components : transformed compliance matrix : thickness : transverse load, temperature : strain energy : displacement in (x,y,z) : volume fraction : global co-ordinate system : failure criteria function : ratio between quantiles in the marginal distributions and extreme-value distributions : thermal expansion coefficient : loading mode factor : thermal swelling coefficient, or boundary conditions factor : direct strain, i.e. ε 1 in the main direction : strain to failure : strain field : shear strain : partial load factors DET NORSKE VERITAS AS
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OS-C501

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