CN103605865A - Delamination propagation behavior simulation method of composite material multidirectional laminated plate on basis of cohesion model - Google Patents
Delamination propagation behavior simulation method of composite material multidirectional laminated plate on basis of cohesion model Download PDFInfo
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Abstract
The invention relates to a delamination propagation behavior simulation method of a composite material multidirectional laminated plate on the basis of a cohesion model. The method includes the following steps that (1) a geometric model is built according to structural parameters of a composite material multidirectional laminated plate test piece, (2) key parameters capable of reflecting interfacial behaviors are calculated, and material attributes are respectively set, (3) meshing is carried out on the geometric model of the composite material multidirectional laminated plate test piece, a module is assembled, and a three-dimensional finite element model is built, (4) a load and boundary conditions of the finite element model are determined according to practical situations and the load state of a composite material structure, (5) the finite element model based on the cohesion model is calculated and analyzed, a load displacement curve of a loading point is extracted, delamination propagation behaviors of the composite material multidirectional laminated plate are simulated to obtain the largest load value of the load displacement curve, and damage behaviors of the multidirectional laminated plate are predicted.
Description
Technical field
The present invention relates to the multidirectional laying plate of a kind of compound substance based on cohesive zone model delamination Behavior modeling method, be applicable to research and the prediction of the behavior of the multidirectional laying plate of the widely used compound substance in the fields such as Aero-Space delamination.
Background technology
Advanced composite material is widely used at present in aerospace structure, and has become aerospace four macrostructure materials together with aluminium alloy, titanium alloy, alloy steel.Wherein, carbon fiber resin matrix composite, when having compared with high specific strength, has specific stiffness concurrently high, anticorrosive, fatigue behaviour good and the plurality of advantages such as performance designability and become the main a kind of compound substance using in aircaft configuration in modern age.Along with the batch production of middle modulus high-strength carbon fiber and the application of toughened resin, this class compound substance application in aircaft configuration is also developed into the main force support structure of force-bearing situation complexity gradually by inferior load-carrying construction.And the safety of structure of compound substance is also more and more valued by the people.
Different from metal material, the failure mode of compound substance and failure mechanism are more complicated various.Due to component material---the greatest differences of fiber and matrix mechanical property, the interlayer performance of composite laminated plate is far below performance in its face, in different loads situation, the layering that low velocity impact or geometric discontinuity cause is expanded under fatigue load, finally causing the flexing of sublayer plate, is a kind of main damage form of practice of composite laminate structures.Delamination behavior meeting causes strength and stiffness to incur loss, for integrality and safety period of structure be all extremely disadvantageous, the calamitous structural failure that even may cause outside to be difficult for discovering.Therefore, in design and analysis process, to the prediction of compound substance delamination behavior, be, a very important job.
DCB test and MMB test are often used in the fracture toughness under research I type and I/II mixed type loaded-up condition, and corresponding compound substance unidirectional laminate test method (ASTM D5528-01 and ASTM D6671/D6671M-06) is comparative maturity.In generation and the build phase of delamination, cohesive zone model (CZM) is widely applied.Passed through a large amount of research work, adopting linear this to build vertical cohesive zone model can well analog composite material unidirectional laminate crack initiation and growth, and gained predicts the outcome and has test findings and have good consistance.
Compare with the unidirectional laying plate of compound substance, the application of the multidirectional laying plate of compound substance in engineering practice is more extensive.On the different laying interface of the multidirectional laying plate of compound substance machine direction, be easy to the delamination that forms crackle and crackle occurs.Yet the work that composite layer intersexuality the subject of knowledge and the object of knowledge carries out at present mostly also concentrates in the research of compound substance single-ply plate, for rare the relating to of delamination rule at the multidirectional laying of compound substance interface.Due to very complicated with the failure mechanism of interlayer in the multidirectional laying flaggy of compound substance, there is fiber bridge joint, wear the various of failure such as layer expansion, and document that can be for reference is very limited, for the numerical simulation of the multidirectional laying plate of compound substance delamination, remain at present one and have much challenging work.In order to carry out in this respect new research, to predict the damage expansion in engineering structure, in performance material property advantage, ensure structural safety, need to introduce improved cohesive zone model, reflect better the failure procedure of the multidirectional laying plate of compound substance.
Summary of the invention
Technology of the present invention is dealt with problems: overcome the deficiencies in the prior art, the multidirectional laying plate of a kind of compound substance based on cohesive zone model delamination Behavior modeling method is provided, be applicable to engineering application, can assist multidirectional laying plate laying sequence design, reduce experimentation cost, the multidirectional laying plate of compound substance inefficacy damage mode is carried out to effective analysis and prediction simultaneously, ensure better safety of structure.
Technical solution of the present invention, the multidirectional laying plate of a kind of compound substance based on cohesive zone model delamination Behavior modeling method, performing step is as follows:
Steps A, utilizes the d solid modeling function of finite element software Abaqus, according to the structural parameters of the multidirectional laying plate of compound substance, sets up three geometric models that the multidirectional paving layer test coupon of compound substance is corresponding;
Step B, selects the linear constitutive relation of cohesive zone model, and the critical strain energy release rate that cohesive zone related interfaces parameter and test record is set, and model is arranged respectively to laying direction and material properties;
Step C, to three geometric models difference grid divisions, composition model, sets up three-dimensional finite element model;
Step D, according to the actual conditions of composite structure and loaded-up condition, force analysis situation, determines load, the boundary condition of test specimen, and is applied on finite element model;
Step e, finite element model based on cohesive zone model is carried out to stress analysis, obtain result of calculation, extract the load displacement curve of load(ing) point, the behavior of the multidirectional laying plate of the compound substance of simulation based on cohesive zone model delamination, obtain load displacement curve maximum load value, predict the derogatory behaviour of multidirectional laying plate.
Described steps A is utilized the d solid modeling function of finite element software Abaqus, and the detailed process of setting up geometric model is:
(A1) open Abaqus software, utilize d solid modeling function, according to the multidirectional paving layer test coupon of compound substance values of the structural parameters, in two dimensional surface, draw three geometric profile figure corresponding to test specimen upper, middle, and lower part;
(A2) by entity stretching mode, set up respectively multidirectional 3-D geometric model, wherein upper and lower two parts through-thickness is stretched to half of actual (real) thickness value, and the center section through-thickness at cohesive zone place is stretched to 0.01mm.
Described step B determines the key parameter of reflection interface behavior, and the specific implementation process that material properties is set is:
(B1) definition local material direction, divides upper and lower two parts geometric model according to each laying one-tenth-value thickness 1/10, creates compound substance laying and defines laying angle, when definition laying angle, need to set up corresponding local coordinate system according to actual conditions;
(B2), according to material property parameter, define the material properties of upper and lower two parts geometric model;
(B3) select the linear constitutive relation of cohesive zone model, by subroutine, introduce the critical strain energy release rate changing with crack length that test obtains, calculate initial interface rigidity, boundary strength, the interface parameter of the reflection such as coefficient of viscosity interface behavior, the material properties of definition cohesive zone place center section geometric model.
Described step C carries out respectively grid division to the geometric model of test specimen, composition model, and the detailed process of setting up three-dimensional finite element model is:
(C1) to upper and lower two parts along three direction Even seedings of length, and grid division, this grid does not need very meticulous;
(C2) calculate cohesive zone length, determine cohesion unit size, quantity, according to cohesion unit size and number of unit, to center section Even seeding, divide comparatively meticulous grid;
(C3) three geometric models are assembled successively according to the order from upper, middle and lower, at two assembly and connection interfaces, binding constraints is set, in addition for preventing that laminate upper and lower part from running through, between the two sides, upper and lower part at precrack place, set up contact, set up three-dimensional finite element model.
Described step D determines that geometric model load, boundary condition implementation procedure are:
(D1) judgement I type or I/II mixed type loaded-up condition, carry out force analysis to the multidirectional paving layer test coupon of compound substance, determines restraint condition and the suffered load situation of test specimen;
(D2) using restraint condition above as boundary condition, be arranged on the finite element model of load, on test specimen finite element model, apply the load of force analysis gained simultaneously.
Described step e is carried out computational analysis to cohesive zone model, obtains result of calculation, extracts the load displacement curve of load(ing) point, to the specific implementation process of the multidirectional laying plate of compound substance delamination Behavior modeling, is:
(E1) finite element model is carried out to stress analysis, calculate the strain energy rate of cohesion unit, by reading cohesion unit coordinate information again according to critical strain energy release rate-crack length relation curve, determine the critical strain energy release rate of cohesion unit, by currency and critical value comparison, the spread scenarios of judgement cohesion element failure and crackle;
(E2) obtain result of finite element, utilize the post-processing function of finite element software, extract the load displacement curve of load(ing) point, the behavior of the multidirectional laying plate of analog composite material delamination, obtain load displacement curve maximum load value, when real load reaches maximal value, the expansion of crackle does not need to continue to increase load, thereby realizes the prediction to the behavior of multidirectional laying dash-board injury.
The present invention's advantage is compared with prior art:
(1) the present invention is based on the multidirectional laying plate of the compound substance delamination Behavior modeling method of cohesive zone model, overcome the deficiency of studying for unidirectional laying plate, consider the impact of different fiber directions on the behavior of multidirectional laying plate delamination, the delamination behavior of the multidirectional laying plate of analog composite material, thereby the effectively derogatory behaviour of the multidirectional laying plate of analysis and prediction.
(2) the present invention is based on the multidirectional laying plate of the compound substance delamination Behavior modeling method of cohesive zone model, can effectively analyze and simulate the delamination behavior of the multidirectional laying plate of compound substance at multiple interface, according to Numerical Simulation Results, the design of auxiliary multidirectional laying plate laying direction.
(3) the present invention is based on the multidirectional laying plate of the compound substance delamination Behavior modeling method of cohesive zone model, only need set up cohesive zone model, carry out finite element analysis, can carry out numerical simulation to the behavior of the multidirectional laying plate of compound substance delamination, be applicable to prediction and the analysis of the multidirectional laying plate of the compound substance delamination failure behaviour in engineering application, can significantly shorten the lead time, reduce experimentation cost.
Accompanying drawing explanation
Fig. 1 is realization flow figure of the present invention;
Fig. 2 is three geometric model schematic diagram that the multidirectional paving layer test coupon of compound substance is corresponding;
Fig. 3 is assembling geometric model schematic diagram;
Fig. 4 is the finite element method (fem) analysis process flow diagram based on cohesive zone model.
Embodiment
As shown in Figure 1, the inventive method specific implementation is:
1,, according to the multidirectional paving layer test coupon of compound substance values of the structural parameters, in Abaqus software, set up the geometric model of test specimen.
Open Abaqus software, utilize d solid modeling function, according to the multidirectional paving layer test coupon of compound substance values of the structural parameters, in two dimensional surface, draw respectively the geometric profile figure that test specimen is corresponding, by entity stretching mode, set up respectively 3-D geometric model, as shown in Figure 2, a wherein, c two parts through-thickness is stretched to half of actual (real) thickness value, b part through-thickness stretching 0.01mm.
2, the key parameter of determining reflection interface behavior, arranges laying angle and material properties.
Definition local material direction, according to each laying one-tenth-value thickness 1/10, divide the geometric model of a and c, create compound substance laying and define laying angle, when definition laying angle, need to set up corresponding local coordinate system according to actual conditions, according to material property parameter, the material properties of definition a and c geometric model, select the linear constitutive relation of cohesive zone model, introduce the critical strain energy release rate changing with crack length that test obtains, calculate initial interface rigidity, boundary strength, the parameter of the reflection such as coefficient of viscosity interface behavior, the material properties that definition b model is corresponding cohesive zone.
3, geometric model is carried out respectively to grid division, composition model, sets up three-dimensional finite element model.
To a, c two parts are along three direction Even seedings of length, and grid division, this grid does not need very meticulous, calculate cohesive zone length, determine cohesion unit size, quantity, according to cohesion unit size and number of unit, to b part Even seeding, divide comparatively meticulous grid, by geometric model according to from a, b, the order of c is assembled successively, assembly and connection interface at geometric model a/b and b/c arranges binding constraints, at precrack place, set up contact, as shown in Figure 3, set up three-dimensional finite element model.
4, determine geometric model load, boundary condition.
Judgement I type or I/II mixed type loaded-up condition, the multidirectional paving layer test coupon of compound substance is carried out to force analysis, determine restraint condition and the suffered load situation of test specimen, using restraint condition above as boundary condition, be arranged on the finite element model of load, on test specimen finite element model, apply the load of force analysis gained simultaneously.
5, the multidirectional laying plate of analog composite material delamination behavior.
Finite element model is carried out to stress analysis, calculate the strain energy rate of correspondence position, obtain crack length, again according to critical strain energy release rate-crack length relation curve, determine the critical energy release rate of this position, by currency and critical value comparison, the spread scenarios of judgement cohesion element failure and crackle, idiographic flow as shown in Figure 4, obtain result of finite element, utilize the post-processing function of finite element software, extract the load displacement curve of load(ing) point, the behavior of the multidirectional laying plate of the compound substance of simulation based on cohesive zone model delamination, obtain load displacement curve maximum load value, judgement is when real load reaches maximal value, the expansion of crackle does not need to continue to increase load, thereby realize the prediction to the behavior of multidirectional laying dash-board injury.
Non-elaborated part of the present invention belongs to those skilled in the art's known technology.
Claims (7)
1. the multidirectional laying plate of the compound substance based on a cohesive zone model delamination Behavior modeling method, is characterized in that comprising the following steps:
Steps A, utilizes the d solid modeling function of finite element software Abaqus, according to the structural parameters of the multidirectional laying plate of compound substance, sets up three geometric models that the multidirectional paving layer test coupon of compound substance is corresponding;
Step B, selects the linear constitutive relation of cohesive zone model, and the critical strain energy release rate that cohesive zone related interfaces parameter and test record is set, and model is arranged respectively to laying direction and material properties;
Step C, to three geometric models difference grid divisions, composition model, sets up three-dimensional finite element model;
Step D, according to the actual conditions of composite structure and loaded-up condition, force analysis situation, determines load, the boundary condition of test specimen, and is applied on finite element model;
Step e, finite element model based on cohesive zone model is carried out to stress analysis, obtain result of calculation, utilize finite element post-processing function, extract the load displacement curve of load(ing) point, the behavior of the multidirectional laying plate of the compound substance of simulation based on cohesive zone model delamination, obtains load displacement curve maximum load value, predicts the behavior of multidirectional laying dash-board injury.
2. the multidirectional laying plate of a kind of compound substance based on cohesive zone model according to claim 1 delamination Behavior modeling method, is characterized in that: the geometric model implementation procedure of setting up test specimen according to the structural parameters of the multidirectional paving layer test coupon of compound substance in described steps A is:
(A1) open Abaqus software, utilize d solid modeling function, according to the multidirectional paving layer test coupon of compound substance values of the structural parameters, in two dimensional surface, draw three geometric profile figure corresponding to test specimen upper, middle, and lower part;
(A2) by entity stretching mode, set up respectively multidirectional 3-D geometric model, wherein upper and lower two parts through-thickness is stretched to half of actual (real) thickness value, and the center section through-thickness at cohesive zone place is stretched to 0.01mm.
3. the multidirectional laying plate of a kind of compound substance based on cohesive zone model according to claim 1 delamination Behavior modeling method, it is characterized in that: described step B determines the key parameter of reflection interface behavior, and the specific implementation process that laying direction and material properties are set is:
(B1) definition local material direction, divides upper and lower two parts geometric model according to each laying one-tenth-value thickness 1/10, creates compound substance laying and defines laying angle, when definition laying angle, need to set up corresponding local coordinate system according to actual conditions;
(B2), according to material property parameter, define the material properties of upper and lower two parts geometric model;
(B3) select the linear constitutive relation of cohesive zone model, by subroutine, introduce the critical strain energy release rate changing with crack length that test obtains, calculate initial interface rigidity, boundary strength, the interface parameter of the reflection such as coefficient of viscosity interface behavior, the material properties of definition cohesive zone place center section geometric model.
4. the multidirectional laying plate of a kind of compound substance based on cohesive zone model according to claim 1 delamination Behavior modeling method, it is characterized in that: described step C carries out respectively grid division to the geometric model of test specimen, composition model, the detailed process of setting up three-dimensional finite element model is:
(C1) to upper and lower two parts along three direction Even seedings of length, and grid division, this grid does not need very meticulous;
(C2) calculate cohesive zone length, determine cohesion unit size, quantity, according to cohesion unit size and number of unit, to center section Even seeding, divide comparatively meticulous grid;
(C3) three geometric models are assembled successively according to the order from upper, middle and lower, at two assembly and connection interfaces, binding constraints is set, in addition for preventing that laminate upper and lower part from running through, between the two sides, upper and lower part at precrack place, set up contact, set up three-dimensional finite element model.
5. the multidirectional laying plate of a kind of compound substance based on cohesive zone model according to claim 1 delamination Behavior modeling method, is characterized in that: described step D determines that geometric model load, boundary condition implementation procedure are:
(D1) judgement I type or I/II mixed type loaded-up condition, carry out force analysis to the multidirectional paving layer test coupon of compound substance, determines restraint condition and the suffered load of test specimen;
(D2) using restraint condition above as boundary condition, be arranged on the finite element model of load, on test specimen finite element model, apply the load of force analysis gained simultaneously.
6. the multidirectional laying plate of a kind of compound substance based on cohesive zone model according to claim 1 delamination Behavior modeling method, it is characterized in that: described step e is carried out computational analysis to cohesive zone model, obtain result of calculation, the load displacement curve that extracts load(ing) point, to the specific implementation process of the multidirectional laying plate of compound substance delamination Behavior modeling is:
(E1) finite element model is carried out to stress analysis, calculate the strain energy rate of cohesion unit, by reading cohesion unit coordinate information again according to critical strain energy release rate-crack length relation curve, determine the critical strain energy release rate of cohesion unit, by currency and critical value comparison, the spread scenarios of judgement cohesion element failure and crackle;
(E2) obtain result of finite element, utilize the post-processing function of finite element software, extract the load displacement curve of load(ing) point, the behavior of the multidirectional laying plate of analog composite material delamination, obtain load displacement curve maximum load value, when real load reaches maximal value, the expansion of crackle does not need to continue to increase load, thereby realizes the prediction to the behavior of multidirectional laying dash-board injury.
7. the multidirectional paving layer test coupon of compound substance, it is characterized in that: the multidirectional paving layer test coupon of this compound substance is according to obtaining after the multidirectional laying plate of a kind of compound substance based on the cohesive zone model delamination Behavior modeling methods analyst described in claim 1 to 6 any one, overcome the deficiency of studying for unidirectional laying plate, consider the impact of different fiber directions on the behavior of multidirectional laying plate delamination, obtain load displacement curve maximum load value, thereby effectively predict the derogatory behaviour of multidirectional laying plate, according to Numerical results, can also assist the design of multidirectional laying plate laying order.
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