Research On Interfacial Crack Propagation Using ABAQUS: Application To Artificial Ice Shape

An essential step for civil aircrafts entering the market is to obtain the airworthiness certification.One of crucial first class flying risk examinations is the simulated ice shape flight test. Up till now,research on simulated ice shape for flight test is seldom reported. This paper studies a newsandwich-structured ice shape. This ice shape contains multiple bimaterial interfaces, which influentsthe strength of the whole structure much. Through theoretic analysis, finite element simulation andexperiment verification, the results show that the designed model satisfies the strength requirementand can be used for flight test.Interfacial crack, unlike crack in homogeneous material, has unique stress and strain field. Tostudy the interfacial toughness and propagation of interfacial crack, this paper based on elasticsolution, discusses the definition of stress intensity factor and numerical calculation method. Usingmaximum tangent stress, this paper gives criterion of fracture and predicts the propagation way.This paper also using PYTHON script language develops ABAQUS, successfully simulating thepropagation of interfacial crack. An example is presented, mainly about under different loads, twoway of propagation: along interface and kinking out of interface. It also discusses the change of stressintensity factor and mix mode ratio with propagation of crack. The ice shape is analyzed using thisinterfacial propagation program under loads in tangential direction and direction of resultant force.The initial crack is defined by interface strength theory.Bonding strength experiments are carried out where the ice shape is load in the tangentialdirection and in the direction of resultant force. And the damage loads are obtained respectively. Thedifference between the theoretical and experimental results is quite small, which shows the validationof the analytical method.This paper demonstrates that the designed ice shape satisfies the flight test and the ice shape willnot fall off or damage. Thus, it has a relative high value for engineering.