THIS WORK AIMS TO EVALUATE THE CRITICAL BUCKLING LOAD OF PANELS MADE OF CROSS-LAMINATED TIMBER, CONSIDERING FINITE ELEMENT SIMULATIONS AND DIFFERENT ANALYTICAL METHODS OF CALCULATING THE EFFECTIVE BENDING AND SHEAR STIFFNESS. IN ADDITION, THE EFFECT OF OPENINGS, PRE-CRACKS, AND ADHESIVE STRENGTH ON THE CRITICAL BUCKLING LOAD IS ANALYZED. RESULTS INDICATE THAT THE APPROACH WITH THIN EXTERNAL FACES IS BOTH SIMPLER AND MORE EFFECTIVE. WHEN ESTIMATING THE BENDING AND SHEAR STIFFNESS, THE METHODS THAT SHOW THE LEAST DIFFERENCE ARE THE ?-METHOD AND THE SHEAR ANALOGY METHOD, WITH THE FIRST OF THEM BEING MORE CONSERVATIVE. THE CORRECTED TIMOSHENKO METHOD TENDS TO OVERESTIMATE THE CRITICAL LOAD. MOREOVER, USING COHESIVE ZONE MODELS EMBEDDED IN FINITE ELEMENT SIMULATIONS, THE CRITICAL LOAD IS REDUCED BY AN AVERAGE OF 10% DUE TO THE STIFFNESS OF THE ADHESIVE. FURTHERMORE, WHEN PANELS HAVE ADHESIVE-FREE EDGES, THE CRITICAL LOAD CAN BE REDUCED BY MORE THAN 50%.

THIS STUDY FOCUSES ON THE DESIGN, BEHAVIOR AND EXPERIMENTAL ANALYSIS OF A NOVEL METAMATERIAL, CONSISTING OF AN ASYMMETRIC AUXETIC THREE-DIMENSIONAL STRUCTURE (AATS) INFUSED WITH POLYESTER RESIN. UTILIZING FDM ADDITIVE PRINTING, SAMPLES WERE CREATED WITH CUSTOMIZABLE RESPONSES TO COMPRESSIVE LOADS THROUGH VARIED DESIGN PARAMETERS. THE OBJECTIVE IS TO SURPASS TRADITIONAL MATERIAL BLENDING BY ENHANCING STIFFNESS AND ENERGY ABSORPTION. STRIKING A DELICATE BALANCE, THE AATS ENERGY ABSORPTION PROPERTIES ARE PRESERVED WHILE LEVERAGING THE STIFFNESS OF THE RESIN. DESPITE ITS COMPACT CUBIC FORM, NOT EXCEEDING 27 MM ON EACH SIDE, THIS METAMATERIAL SHOWCASES AMPLIFIED CHARACTERISTICS, BLENDING THE AATS AND POLYESTER RESIN. THE RESULTS HINT AT PROMISING APPLICATIONS ACROSS MILITARY DEFENSE, AUTOMOTIVE, AEROSPACE SECTORS, AND EVEN POTENTIAL REPLACEMENTS FOR ARTICULATED HUMAN SKELETAL COMPONENTS.

THIS ARTICLE IS FOCUSED ON THE STUDY OF A MICRO-MACRO LATIN BASED DOMAIN DECOMPOSITION METHOD (LATIN-DDM) FOR THE PREDICTION OF THE NONLINEAR BEHAVIOR OF SLENDER COMPOSITE STRUCTURES SUBJECTED TO BENDING, BUCKLING AND DELAMINATION. PREVIOUS STUDIES HAVE SHOWN THAT AN ADEQUATE SELECTION OF THE ITERATIVE PARAMETERS (SEARCH DIRECTIONS AND MACROSCOPIC SPACE) ALLOW TO IMPROVE THE CONVERGENCE RATE AND ENSURE SCALABILITY (I.E. NUMBER OF ITERATIONS IS INDEPENDENT OF THE NUMBER OF SUBDOMAINS) OF THE ITERATIVE SCHEMA. TO OBTAIN PRECISE SOLUTIONS, ONLY THE SIZE REDUCTION OF THE SUBDOMAINS DISCRETIZATION HAS BEEN ADDRESSED (H-REFINEMENT), DISREGARDING THE OPTION OF INCREASING THE POLYNOMIAL DEGREE OF THE FINITE ELEMENTS (P-REFINEMENT) AND IGNORING THEIR UNDERLYING EFFECTS ON THE INFORMATIONS TRANSMISSION THROUGH THE INTERFACES BETWEEN SUBDOMAINS. IN THIS WORK AND USING LINEAR AND QUADRATIC FINITE ELEMENTS, H AND P REFINEMENTS ON THE SUBDOMAINS AND LOCAL H-REFINEMENT ONLY ALONG THE EDGES OF THE SUBDOMAINS WERE INVESTIGATED. IT IS CONCLUDE THAT THE PREFINEMENT IN THE WHOLE SUBDOMAIN NOT ONLY ENABLES TO REACH MORE EXACT SOLUTIONS THAN USING GLOBAL OR LOCAL H-REFINEMENT, BUT ALSO THE CONVERGENCE RATE IS IMPROVED. THESE ENHANCEMENTS ALLOW MORE COMPLEX SIMULATIONS BUT USING LESS DEGREES OF FREEDOM AND LESS CALCULATION TIME, EVEN UP TO 97% FASTER.