PSI - Issue 33

Aprianur Fajri et al. / Procedia Structural Integrity 33 (2021) 19–26 Fajri et.al / Structural Integrity Procedia 00 (2019) 000–000

23

5

3.3. Frequency-based If the stress condition that affects the structure has a relatively small amplitude but high frequency, it can usually be predicted using a frequency-based approach (Benasciutti et al., 2016). Electronic components, electrical appliances, high-spinning machines, and vibrations in brackets due to the influence of resonance (Moon et al., 2011) are examples of cases that can be solved using this approach. 3.4. Fracture mechanic approach This approach focuses on Fatigue crack propagation due to cyclic loads (Barcelos and Palma, 2020). The assumption was that there was an initial crack in the structure. Initial crack can be in the form of production defects, fabrication influences, welding defects, scratched cutting tools, impact notch, and so forth. The fracture toughness data is needed to investigate the fatigue phenomenon using this approach. 4. Fatigue study in marine structure Studies on the fatigue phenomenon in marine structures over the past decade have overgrown. Table 1 shows that the trend of research, especially in marine structures, experienced improvement. Various objects that could potentially experience fatigue failure were identified one by one. There are several guidelines related to fatigue assessment that is often used as a reference by researchers. This guideline contains rules on methods, technical requirements, principles, and acceptance criteria of assessment. Several procedures can be used for marine structures, such as (DNV GL, 2015) for fatigue assessment on ship structures; (DNV GL, 2016) for fatigue assessment on machinery propulsion; and (DNV GL, 2020) for fatigue assessment subjected to ice interaction loads. The methods used are increasingly diverse and contribute positively to science development, especially in structural integrity.

Table 1. The landmark of the fatigue study in marine structure. Milestone Author

Observational Object

Method

2012

(Tasdemir and Nohut, 2012)

Ship structures with hinged deck design

FEM with three type analysis (global model, fine-mesh, and stress concentration models) Numerical analysis procedure suitable for time-domain-based direct calculation of fatigue damage and FEA Numerical study on Fatigue Crack Growth (FCG-system) using ABAQUS

2013

(Li et al., 2013)

Ship side-shell structures (Panamax container vessel)

2014

(He et al., 2014)

Web-stiffener of ship structural details

2014

(Ertas et al., 2014)

Mercantile vessel shipboard under working conditions a container vessel in a harsh sea state

Analytic and numeric (FEA)

2014 2017

(Ringsberg et al., 2014) (Vukelić and Vizentin, 2017) (Gledić et al., 2019)

Linear and nonlinear FE analyses Identification of failure case

Ship propulsion shafts

2019

Low-cycle fatigue of ship hull damaged in the collision (Aframax-class double-hull oil tanker)

FEM (strain-life approach, hot-spot stress)

2020

(Giallanza et al., 2020)

New FML composites for lightship buildings Fatigue crack growth (FCG) using ANSYS and validate using the experimental test.

2020

(Ozguc, 2020)

FPSO hull side shell longitudinals

Component stochastic and Full Spectral Method A frequency-time domain using the spectral based method (hybrid method) and experiment test

2021

(Yue et al., 2021)

A ship structure (4600TEU container forecasted)