XII
Table of contents
4.1.4 Numerical modelling with 3D-contiuum elements .............................. 59
4.1.5 Conclusion ........................................................................................... 62
4.2 Face sheets ..................................................................................................... 62
4.2.1 Experimental analysis .......................................................................... 64
4.2.2 Numerical modelling and calibration ................................................... 65
4.3 Adhesives ........................................................................................................ 68
4.3.1 Experimental analysis .......................................................................... 68
4.3.2 Numerical modelling and calibration ................................................... 72
5 Mechanical characterization on structural element level ................................... 73
5.1 Panel flexure ................................................................................................... 73
5.1.1 Experimental analysis .......................................................................... 75
5.1.2 Numerical analysis ............................................................................... 79
5.2 In-plane shear ................................................................................................. 87
5.2.1 Experimental analysis .......................................................................... 87
5.2.2 Numerical analysis ............................................................................... 88
5.3 Additional test methods ................................................................................. 91
6 Mechanical characterization on sub-component level ....................................... 95
6.1 Threaded inserts perpendicular to the face sheet .......................................... 95
6.1.1 Out-of-plane tension (pull-out) ........................................................... 96
6.1.2 In-plane tension (shear) ....................................................................... 99
6.2 L-Joints .......................................................................................................... 100
6.2.1 L-Joint bending test ........................................................................... 101
6.2.2 L-Joint shear test ............................................................................... 102
7 Virtual testing approach for sandwich panel joints .......................................... 105
7.1 Overview ....................................................................................................... 105
7.2 Phase 1 - Problem analysis ........................................................................... 106
7.3 Phase 2 - Definition of model framework ..................................................... 110
7.4 Phase 3 - Model development ...................................................................... 114
Table of contents
4.1.4 Numerical modelling with 3D-contiuum elements .............................. 59
4.1.5 Conclusion ........................................................................................... 62
4.2 Face sheets ..................................................................................................... 62
4.2.1 Experimental analysis .......................................................................... 64
4.2.2 Numerical modelling and calibration ................................................... 65
4.3 Adhesives ........................................................................................................ 68
4.3.1 Experimental analysis .......................................................................... 68
4.3.2 Numerical modelling and calibration ................................................... 72
5 Mechanical characterization on structural element level ................................... 73
5.1 Panel flexure ................................................................................................... 73
5.1.1 Experimental analysis .......................................................................... 75
5.1.2 Numerical analysis ............................................................................... 79
5.2 In-plane shear ................................................................................................. 87
5.2.1 Experimental analysis .......................................................................... 87
5.2.2 Numerical analysis ............................................................................... 88
5.3 Additional test methods ................................................................................. 91
6 Mechanical characterization on sub-component level ....................................... 95
6.1 Threaded inserts perpendicular to the face sheet .......................................... 95
6.1.1 Out-of-plane tension (pull-out) ........................................................... 96
6.1.2 In-plane tension (shear) ....................................................................... 99
6.2 L-Joints .......................................................................................................... 100
6.2.1 L-Joint bending test ........................................................................... 101
6.2.2 L-Joint shear test ............................................................................... 102
7 Virtual testing approach for sandwich panel joints .......................................... 105
7.1 Overview ....................................................................................................... 105
7.2 Phase 1 - Problem analysis ........................................................................... 106
7.3 Phase 2 - Definition of model framework ..................................................... 110
7.4 Phase 3 - Model development ...................................................................... 114