{"id":39536,"date":"2025-12-09T07:58:21","date_gmt":"2025-12-09T07:58:21","guid":{"rendered":"https:\/\/www.hindfocusnews.com\/the-effect-of-fiber-orientation-and-laminate-2\/"},"modified":"2025-12-09T07:58:21","modified_gmt":"2025-12-09T07:58:21","slug":"the-effect-of-fiber-orientation-and-laminate-2","status":"publish","type":"post","link":"https:\/\/www.hindfocusnews.com\/?p=39536","title":{"rendered":"The Effect of Fiber Orientation and Laminate Stacking Sequences on the Torsional Natural Frequencies of Laminated Composite Beams"},"content":{"rendered":"

The laminates were analysed using an IMATEK IM10 drop weight impact tester with an increment of 5 J until the samples were perforated. In practical applications, it means that if a torsional natural frequency excites the structure, the designer can change the material properties by changing the laminate stacking sequence, instead of re-design the complete structure. The analytical results by both classical lamination theory and shear deformation theory; the coupling effects due to bending–twisting coupling stiffness result from fiber orientation and laminate stacking sequences are excluded.<\/p>\n

Table 5.<\/h2>\n

In Figure 6, the PPPP-untreated and PPPP-treated laminates exhibited a similar force–displacement curve trend. Stiffness of the CPPC laminate was significantly higher than that of the PCCP laminate, at queenwin casino review<\/a> which CPPC laminate was able to almost withstand 30% more impact content force. The laminates were tested at varying energy levels with increments of 5 J until the samples were perforated. Due to the high potential of the PALF\/carbon laminate composite, it is possible to explore its use in future applications. Consequently, the effects of the glass\/natural fibre-reinforcement stacking sequence were also examined in various hybrid formulations with GFRP 30,31,32.<\/p>\n

Figure 8.<\/h2>\n

This behaviour could result from a random distribution of carbon fibres across the plies since the lamina geometry above and below the midplane are identical 35,36. Average flexural and tensile properties of the CFRP with different stacking sequences. However, one notable observation in this case (Figure 3a) is that the laminate spontaneous catastrophic failure occurred immediately after the maximum load was attained due to fibre breakage. Subsequently, the laminates experience a sudden drop in load due to failure within the internal plies, followed by continuous stress fluctuations at an increasing deformation rate. Five specimens per laminate with dimensions of 75 mm ×10 mm×3.5 (±0.1) mm, as shown in Figure 2c, were also tested on a Zwick Roell HIT25P pendulum impact tester with a working capacity of 7.50 J following the ASTM D6110 recommendation.<\/p>\n

Figure 14.<\/h2>\n

Maximum contact force and displacement against impact energy of the hybrid laminates at a ply orientation of ±45°n. Maximum contact force and displacement against impact energy of the hybrid laminates at ply orientations of 0°\/90°8. The impact behaviours of the hybrid laminates at varying ply orientations and stacking sequences are shown in Figure 3, Figure 4, Figure 5, Figure 6, Figure 7, Figure 8, Figure 9 and Figure 10. For this, the influences of ply angle as well as laminate stacking sequences on the torsional natural frequencies of the laminated beams with doubly symmetrical cross- sections are investigated. The torsional vibrations of the laminated beams are analyzed analytically based on the classical lamination theory, and accounts for the coupling of flexural and torsional modes due to fiber orientation of the laminated beams are neglected. An essential factor determining the type of failure exhibited by a composite laminate is the ply stacking sequence that also determines the orientation of the fibre 20,48,49.<\/p>\n

Figure 10.<\/h2>\n
    \n
  • Figure 15a shows the energy profiling diagram of the hybrid laminates at a ply orientation of 0\u00b0\/90\u00b08.<\/li>\n
  • The randomly oriented crack patterns align with the laminates\u2019 ply orientation, as shown in Table 4, Table 5 and Table 6.<\/li>\n
  • Due to the high potential of the PALF\/carbon laminate composite, it is possible to explore its use in future applications.<\/li>\n
  • Thus, in the dynamic analyses, it is quite essential to consider an overview of the free vibration characteristics, including the natural frequencies of these composite structures.<\/li>\n
  • In the analytical models, the flexural-torsional coupling effects are ignored and pure torsional vibrations are taken.<\/li>\n
  • Also, composite structural elements consisting of a relatively weak matrix reinforced by stronger inclusions or of different materials in contact are of increasing technological importance in engineering.<\/li>\n<\/ul>\n

    Teh and Huang presented two finite element models based on a first-order theory for the free vibration analysis of fixed-free beams of general orthotropy. S. Irfan sadaq (contribution) Supported in fabrication of laminates. Stacking sequences inter-ply along with orientations (0°,30°,45°,60°,90°) are used. In the present work composites based on unsaturated polyester resin reinforced with pineapple leaf fibers (PALF) are studied.<\/p>\n

    Trash Pineapple Leaf Fiber Reinforced Polymer Composite Materials for Light Applications<\/h2>\n

    This experiment utilised a 650 mm wide and 900 mm long glass mould to fabricate the composite. The resin content of the material is 35 ± 3% by weight, while the aerial weight of the fibre is 450 g\/m2. The carbon\/epoxy prepreg tape used in the experiment was sourced from Gurit Composite Company. The results revealed that the position of the lamina influences the impact response.<\/p>\n

    Table 2.<\/h2>\n

    Contact force–displacement of the hybrid laminates at a ply orientation of ±45°8. Contact force–displacement of the hybrid laminates at ply orientations of 0°, 90°8. Figure 3 shows the force–displacement curve for the hybrid laminates at a ply orientation of 0°\/90°8, while Figure 4 shows the force–time curves. On average, the hybrid laminates exhibited superior impact strength over the non-hybrid laminates. In comparison to the samples coated with natural fibre layers, the samples covered with high-strength carbon layers exhibited higher flexural strength at low impacts.
    \nSteel beams or columns totally encased in concrete are most common examples, while construction using steel beams as stiffeners of concrete plates is a quick, familiar and economical method for long bridge decks or for long span slabs. The theory includes the material coupling between the bending and torsional modes of deformations. The study of such free vibrations (free because the structure vibrates with no external forces) is very important in finding the dynamic response of the elastic structure. This condition is called resonance and to avoid resonance, the natural frequencies of the structure must be altered by making suitable adjustments in the design.<\/p>\n

      \n
    • Thereafter, the cracks spread along and perpendicular to the entire surface of carbon ply as the impactor moved downwards; as a consequence, force indentation indicates a prolonged stable plateau right after the peak force.<\/li>\n
    • Sudarisman and Davies reported a maximum Ef of 61.10 GPa for a unidirectional carbon fibre-reinforced, epoxy laminate fabricated using an autoclave processing technology.<\/li>\n
    • The effectiveness of material symmetry can be observed by comparing the flexural properties of LM2 with LM3.<\/li>\n
    • The in-plane extensorial force, which is anisotropic, affects the fracture behaviour of the laminates 63,64.<\/li>\n
    • The influence of boundary conditions on torsional natural frequencies is investigated for the 1st torsional frequency as shown in Figure 6.<\/li>\n
    • In civil engineering, fibre-reinforced polymer composites (FRPs) are used in reinforcing bars, sandwich panels and structural retrofitting 8,9.<\/li>\n
    • Energy profiling diagram of the hybrid laminates at ply orientations of (a) 0\u00b0\/90\u00b08, (b) \u00b145\u00b08, (c) \u00b145\u00b02, 0\u00b0\/90\u00b02 s, and (d) 0\u00b0\/90\u00b02, \u00b145\u00b02s.<\/li>\n<\/ul>\n

      The CPPC laminate demonstrated a significantly greater impact level at 20, 25, and 27.5 J for indentation (maximum), penetration, and perforation, respectively, compared to the PCCP laminate. Damaged areas of the PCCP at ply orientations of 0°\/90°2, ±45°2s and ±45°2, 0°\/90°2s. It was demonstrated that the PPPP-untreated polymer matrix could not properly distribute the impact load due to the hydrophobic nature of the polymer matrix, resulting in poor interfacial bonding between them . The PPPP-untreated exhibited no visible indentation compared to PPPP-treated with a mild circular indentation at the top side and a hairline crack propagated along the ply direction.
      \nCaminero, Rodriguez and Munoz studied the effect of stacking sequence on the Charpy and flexural damage of carbon fibre-reinforced polymer composite (CFRP) laminates. In this work, the effect of ply stacking sequence of carbon\/epoxy laminates subjected to flexural, tensile and impact loading was investigated. PALF\/carbon hybrid laminate composites have the potential to replace synthetic fibres due to their good mechanical qualities.<\/p>\n","protected":false},"excerpt":{"rendered":"

      The laminates were analysed using an IMATEK IM10 drop weight impact tester with an increment…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1214],"tags":[],"class_list":["post-39536","post","type-post","status-publish","format-standard","hentry","category-casino-11"],"_links":{"self":[{"href":"https:\/\/www.hindfocusnews.com\/index.php?rest_route=\/wp\/v2\/posts\/39536","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hindfocusnews.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.hindfocusnews.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.hindfocusnews.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.hindfocusnews.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=39536"}],"version-history":[{"count":0,"href":"https:\/\/www.hindfocusnews.com\/index.php?rest_route=\/wp\/v2\/posts\/39536\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.hindfocusnews.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=39536"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.hindfocusnews.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=39536"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.hindfocusnews.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=39536"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}