analysis of metal to composite adhesive joint in space applications using anasys ‘czm’ technique
DESCRIPTION
The objective of this thesis is to analyze a cohesive joint between a metal and a composite material. This type of joint is used in many metal-composite hybrid design and have application in many field specially in Rocketry. In this project an investigation has been done to check the possibility of a metal-composite hybrid design of a Turbine Exhaust Duct (TED) used in space rocket. To do this job Cohesive Zone Modeling (CZM) technique of ANSYS has been adopted.TRANSCRIPT
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ANALYSIS OF METAL TO COMPOSITE ADHESIVE JOINT IN SPACE APPLICATIONS
USING ANASYS ‘CZM’ TECHNIQUE
Presented By
L Laxman Rao ME 4th Semester
(Roll No.:xxxxxxxxx)
Under Guidance of
Prof. Sanjeev Shrivastava (Associate Professor)
Department of Mechanical Engineering Shri Shankaracharya Group of Institutions
Faculty of Engineering and Technology Junwani, Bhilai (C.G.)
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Objective of this thesis:
The objective of this thesis is to analyze a cohesive joint between
a metal and a composite material. This type of joint is used in
many metal-composite hybrid design and have application in
many field specially in Rocketry.
In this project an investigation has been done to check the
possibility of a metal-composite hybrid design of a Turbine
Exhaust Duct (TED) used in space rocket. To do this job
Cohesive Zone Modeling (CZM) technique of ANSYS has been
adopted.
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Traditionally in engineering, structural joining has been
synonymous to riveting, bolting and other purely mechanical
fastening together with welding or soldering in the case of
metallic construction materials. Up until the introduction of the
polymeric adhesives around the time of the Second World War
these were the only means of joining available but with the
increased use of plastics, and more importantly fiber reinforced
composite materials, the use of adhesive joining has increased
rapidly and is today found in numerous applications with
different material configurations [3].
About Cohesive Joint:
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The reason for the increased use of adhesive joining is that it can
provide a number of structural and economical advantages over
more traditional methods of joining, of course assuming that the
joint is properly designed. One of the most important features to
keep in mind during the initial joint design is that adhesive joints
are very strong in shear, but unfortunately are very vulnerable to
normal stresses (in the context of adhesives commonly referred to
as peel stresses). Provided that the joint is loaded in its favorable
direction, some of the advantages are [4]:
Contd….
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High strength to weight ratio
Stresses distributed evenly over the joint width
No drilled holes needed
Weight and material cost savings
Improved aerodynamic surface design
Superior fatigue resistance
Outstanding electrical and thermal insulation
Contd….
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Contd….
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Contd….
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Contd….
Figure 1: Cross sections of different adhesive joints.
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As with any other technology, there are also limitations to
consider when using adhesives in engineering. Elevated
temperatures and high humidity can result in negative effects on
the strength of some types of adhesives, especially when under
continuous stress, and as with other polymeric materials, creep
effects must be considered. Even though manufacturing
procedures such as drilling, machining and riveting can be
avoided when using adhesive fastening, this is replaced with a
need for careful surface preparation prior to bonding, especially
when using metal adherents.
Contd….
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When designing an adhesively bonded structure, one of the first
questions that arise is the cross-sectional geometry of the joint.
Since the joint geometry greatly affects the stress distribution in
the adhesive it must be carefully selected with the expected load
case, adherent materials and global structural allowances in mind.
Figure1 shows a comprehensive overview of the most commonly
used engineering adhesive joints and the terminology of the
various adherent shapes [5].
Contd….
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The simplest type of joint, the single-lap joint (SLJ), is due to its
simplicity commonly occur-ring and frequently used for test
specimens. The load bearing capabilities are however limited by
peel stresses induced by a bending moment resulting from the
pulling forces not being collinear. These peel stresses can be
severely reduced by instead using a double lap joint (DLJ) that is
symmetric about its longitudinal centerline (see Figure 2), but
even with the peel reduced to manageable levels, the stress state
in the adhesive is complicated and not easily determined. In fact,
most of the other joint configurations shown in Figure 1 are
designed as different ways of reducing local end stress
concentrations and peel.
Contd….
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Contd….
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Contd….
Figure 2: Overview of a loaded SLJ with and without an adhesive spew fillet. Areas sensitive to crack initiation are marked in red. [5]
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Analytical Methode: Volkersen’s Shear Lag Analysis:
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Contd….
Where,
In the above equations, t is the thickness, G is the adhesive shear modulus, E is the Young’s modulus of the adherents and l is the length of the overlap. Subscripts 1, 2 and 3 are the two adherents and adhesive layer respectively.
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Goland And Reissner: Another classic analytic work in the field of adhesive joints, that also takes these additional factors into consideration, was presented by Goland and Reissner in 1944 [6]. The rotation of the joint causes the problem to become geometrically nonlinear, and Goland and Reissner have taken this into account by introducing a bending moment factor, which relates the bending moment at the end of the overlap to the in-plane loading. The shear stress distribution of Goland and Reissner is given by
Contd….
Where,
(6)
(7)
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Contd….
The transverse or peel stress distribution is given by:
Where,
(8)
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Figure below shows a comparison of shear stress distribution between Volkersen’s shear lag analysis and Goland and Reissner’s second case. The adherends are 4.0 inches long by 1.0 inch wide and have a thickness of 0.5 inches. The bonded area was 1.0 inch wide by 1.0 inch long with an adhesive thickness of 0.03 inches.
Contd….
Figure 3: Comparison between shear stress distribution of Volkersen and Goland &Reissner for an applied load of 2000 lbs.
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Structural Analysis of Test Specimen Before a simulation is done on TED model a FEA model validation has been performed on a Test Specimen of following dimension. The result of the test specimen has been validated with reference [12] and [14].
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Contd….
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Contd….
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Contd….
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Contd….
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Contd….
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Turbine is used in a Rocket for the LOX and LH2 fuel supply pump systems. In the Hydrogen Turbo-Pump (TPH), high pressure gaseous hydrogen (GH2) provides the power through a turbine connected to the pump drive shaft. After passing the turbine, the GH2 is passed through the Turbine Exhaust Duct (TED) in which it is divided into a main flow to power the Oxygen Turbo-Pump (TPO) and a secondary by-pass that can be passed on directly to the combustion chamber. Turbine data for which duct has been designed [12] [14]: Nominal Speed : 91000 rpm (max 102000rpm) Nominal Power Output : 2500 kW (max 3700 kW) Mean Gas Dia : 120 mm Mass flow : 4.9 kg/s Turbine Inlet Pressure : 180 Bar (max 232 Bar) Turbine inlet temperature : 245 K (Max 325 K) Pressure ratio : 2:1
The Turbine Exhaust Duct (TED)
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Contd….
Figure 4: Hydrogen Turbo Pump components with TED at left.
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Contd….
Figure 5: Solid Model of Hydrogen Turbo Pump Exhaust showing TED.
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CZM Analysis In Ansys
Before we go for simulation of the TED adhesive joint in ANSYS using CZM technique we should put the detailed drawing of the joint. This drawing shows the dimensions as well as represents the boundary conditions of the problem.
Figure 6: Basic measurements and BC’s for the initial 2D axisymmetric TED model.
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Joint Geometry Concepts
Figure 7: The embedded straight end joint geometry concept .
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Contd….
Figure 8: The short tapered end joint geometry concept .
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Contd….
Figure 9: The fully tapered end joint geometry concept .
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Analysis of tapered adhesive joint in ANSYS
Figure 10: Meshed view of fully tapered end joint geometry.
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Load Case I
Parameter Value
Internal Fluid (Bulk) Temperature TB,I 40 K
Internal Film Coefficient hf,I 20 W/m2K
External Fluid (Bulk) Temperature TB,E 313 K
Extrnal Film Coefficient hf,E 20 W/m2K
Table 1: Load case specification for static cryogenic case (Load Case 1)
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Table 2: Load case specification for the transient operation case (Load Case 2)
Contd….
Parameter Value Internal Pressure P See Table 3.0
Internal Fluid (Bulk) Temperature TB,I See Table 3.0 Internal Film Coefficient hf,I See Table 3.0
External Pressure PE 0 Pa External Fluid (Bulk) Temperature TB,E 293 K
Extrnal Film Coefficient hf,E 20 W/m2K Axial Force Fy 70 KN
Axial Torque My 270 Nm
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Table 3: Specification of time-dependent load parameters for Load Case 2
Contd….
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Figure 10: Meshed view showing DOF Boundary Condition.
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Figure 11: Meshed view showing Loading Condition.
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Figure 12: Deflection of the model under given loading and DOF.
Result :
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Figure 13: Equivalent Stress distribution (Von-Misses) of the model.
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Figure 14: Frictional Stress distribution of the adhesive contact of the model.
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Figure 15: Thermal Strain distribution of the adhesive contact of the model.
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Figure 16: Temperature distribution of the adhesive contact of the model.
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Conclusion and future scope: CZM technique of the FEA software ANSYS is very useful as well as strong tool to analyze any cohesive joint. This technique enables us to test any adhesive configuration without going into any physical testing. The result generated from the analysis done in this project is very much with actual test of a real adhesive joint [12]. So, we can use this technique to analyze design of different hybrid component made with metal as well as composite material.
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References: 1. Gupta N. K., “ Turbomachines for Cryogenic Engines”, Proceedings of the 37th National &
4th International Conference on Fluid Mechanics and Fluid Power, Decenber 2010, IIT Madras.
2. MATTSON D, LUNDSTRÖM R AND EMAN J, "Preliminary studies of typical stresses in composite to metal joints for aerospace applications," CR09-25, Swerea SICOMP, Piteå, 2009.
3. BHOWMIK S, BENEDICTUS R, POULIS J A, BONIN H W AND BUI VT, "High-performance nanoadhesive bonding of titanium for aerospace and space application," International Journal of Adhesion & Adhesives, 2009, 29:259-267.
4. TOMBLIN J S, YANG C, and Hartner P, "Investigation of Thick Bondline Adhesive Joints," DOT/FAA/AR-01/33, U.S. Department of Transportation, Washington, DC, 2001.
5. ADAMS R D, Comyn J, and Wake W C, Structural Adhesive Joints in Engineering, 2nd ed. London, UK: Chapman & Hall, 1997.
6. VOLKERSEN O, "Die Nietkraftverteilung in zugbeanspruchten Nietverbindungen mit konstanten Laschenquerschnitten," Luftfahrtsforschung, 1938, 15:41-47.
7. GOLAND M AND REISSNER E, "The Stresses in Cemented Joints," Journal of Applied Mechanics, ASME, 1944; 66:A17-A27.
8. TORSTENFELT B, Finite Elements - From the Early Beginning to the Very End, Preliminary ed. Linköping: Linköpings Univeristet, 2007.
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9. HUGHES T, The Finite Element Method: Linear Static and Dynamic Finite Element Analysis.: Dover Publications, 2000.
10. HARRISON N L AND HARRISON W J, Journal of Adhesion, 1972; 3:195.
11. WOOLEY G R AND CARVER D R, Journal of Aircraft, 1971; 8:8 17.
12. JANS SON N, "Method for Estimation of Ultimate Strength of Adhesive Joints," VOLS: 10097121, Volvo Aero Corporation, Trolhättan, 2010.
13. SCHMIDT P, "Computational Models of Adhesively Bonded Joints," Linköping University, Linköping, PhD Thesis 2007.
14. Fredrik Fors SCHMIDT P, " Analysis of Metal to Composite Adhesive Joints in Space Applications Computational Models of Adhesively Bonded Joints," Linköping University, Linköping, PhD Thesis (LIU-IEI-TEK-A—10/00812—SE ), 2010.
15. IRWIN G R, "Analysis of stresses and strains near the end of a crack transversing a plate," Journal of Applied Mechanics, 1957; 24:361-366.
16. ANDERSON T L, Fracture Mechanics - Fundamentals and Applications, 3rd ed. Boca Raton, FL: CRC Press, 2005.
17. ALFANO G AND CRISFIELD M A, "Finite element interface models for the delamination analysis of laminated composites: mechanical and computational issues," International Journal for Numerical Methods in Engineering, 2001;
Contd….
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THANK YOU