Sandwich structures are becoming more common in a variety of industries, including aerospace, automotive, marine, and defense. As a result of the increased demand, a significant amount of research has been conducted on improving existing materials as well as developing new pack structure components, such as skin, glue, and core. Studies in sandwich structure core materials are primarily directed at improving the materials' energy incorporation capability, which enhances the crash performance of the entire pack in structure. Honeycomb, folded, and foam are the.most favoured cellular materials to employ in sandwich construction because they provide great rigidity, a high strength-to-weight ratio, and good energy absorption. The manufacturing and processing costs of honeycomb and folded cellular structures are significant. When used in sandwich construction, they also suffer from trapped moisture in the core material. Stochastic cell structures, such as foam, may improve a structure's mechanical qualities, but its unequal structure leads to overdesign due to a high factor of safety to allow for faults and inconsistent presentation. Because of their highly hierarchical compass reading and high strength-to-weight ratio, lattice materials are gaining popularity as core materials. Microlattice materials are lattice materials with dimensions near

to micrometre scale that can be manufactured thanks to recent advancements in various manufacturing processes, particularly the use of fast prototyping manufacturing technologies such as 3D printing. Summary of Invention
Figure depicts a typical compressive behavior of cellular materials. It may be established whether the material behavior is bending under enemy control or stretch-dominated using the general compressive stress strain curve produced from uniaxial testing. Open cell or stochastic materials exhibit bending under enemy control behavior, whereas closed-cell or occasionally open cell periodic materials exhibit stretch under enemy control behavior. Because of their differing collapse modes, the modulus and initial yield strength of stretching under enemy control structures are substantially stronger than those of bending dominated structures of the same relative density, and so are more weight efficient for structural purposes. Due to broken cell edges from post processing, both sorts of arrangements frequently encounter an initial settling era, which is followed by a linear elastic zone represented by the solid black lines. The dotted line represents bending-dominated structures, which display a peak stress and failure followed by a nearly constant plateau stress at a lower stress level. As the strain increases, the plateau continues until the relative density approaches unity, at which point the stress level quickly rises. The dashed line represents the stretching under adversary control

structures, which shows failure start followed by linear stress escalation with a slope substantially lower than the elastic zone.
The phenomenon was dubbed "global collapse." Local defect governed the collapse of the structure without face-sheets, causing shear bands to emerge, though not in a regular outline. The structures demonstrated the ability to absorb huge amounts of energy while reducing and managing the stresses generated, which are important characteristics of an effective energy absorber. It was also discovered that the linear behavior of structures formed using a metal textile technique outperforms open and closed cell stochastic foams with low relative thickness. Powders of lower thickness, such as titanium and aluminum alloys, can be employed in SLM manufacturing, but the course becomes more difficult as the laser melting process becomes more unstable with more reactive metal powder.
Brief description of the system
Mechanical qualities of microlattices are influenced by a number of factors, including the parent material's mechanical properties, cell geometry and connectivity, relative density, and the process used. When subjected to uniaxial compression, micro lattices mostly exhibit bending under enemy control stress strain response, with a large stress plateau followed by a peak stress. Micro failure mechanisms are dictated by the orientation of micro struts, with pyramidal shape

being the most favored; three failure types are found, including tension yield, compression yield, and strut buckling. Although there is a scarcity of experimental data on the behavior of microlattices subjected to impact and blast loading at the moment, this novel class of material has promising potential for submission in high impact scenarios, i.e. high strain loading applications. To date, high strain experimental approaches have looked at microlattices as a block, but detailed analysis at the unit cell level is essential for accurate characterization of material response.
Microlattice modelling is a technique for simulating microstructures. Microlattices are not new materials, but rather a new type of microscale structure. In recent years, the finite constituent method has been utilised to construct numerous modelling approaches. The majority of the modelling was done in continuum scale, which is a macroscopic technique that uses range scale to try to mimic the microlattice reaction at the macroscopic level. In numerical modelling, the strut members of a lattice structure are assumed to have uniform mechanical properties and microstructure. Individual struts are exposed to microstructure and defect sizes fluctuations in reality, which can alter the local property.
The aforementioned modelling methodologies were based on a widely used FEA method. Solid elements and beam rudiments were used to urbanize the models; however beam elements would be more computationally efficient. The method

entails utilizing an isotropic elastic plastic constitutive model, which can be either rate-dependent or rate-independent. Uniaxial yield stress as a function of uniaxial corresponding plastic strain is commonly utilized and characterized as the isotropic yield deciding factor. In lattice systems, isotropic hardening is utilised to define the material's post-yield reaction. As plastic strain occurs, an isotropic material's yield surface (yield stress) grows evenly in all directions. Yield stress in relation to plastic strain is used to determine isotropic hardening, which is entered in a tabular format. For any given value of strain, the value of yield stress is interpolated from the data table and remains constant when it exceeds the last specified value in the table. Finally, due to the inclusion of three sources of nonlinearity that are included in the FE models: material nonlinearity, boundary nonlinearity, and geometric nonlinearity, a nonlinear FE psychiatry is undertaken. For smaller strains, the material acts linearly, but for big strain problems in the post-yield scenario, material nonlinearity must be considered.

CLAIMS

We Claim:

1. Lightweight structural designs that can absorb acoustic, shock, and vibration energy are of great importance to the aerospace industry.
2. After the kinetic energy of an impact event is converted, cellular materials can bend plastically within the core.
3. Microlattices have a high energy absorption capacity, which is of particular relevance to the automotive sector since energy-absorbing materials must be used to protect passengers from collision when constructing a car or motor vehicle.

4. Microlattices are appropriate for usage as cores in sandwich panels or sacrificial cladding because they can withstand substantial plastic deformations at a nearly constant stress level.
5. For the same plateau stress level, longer plateau stressors absorb more energy than those that reach the densification strain more quickly.
6. Investment casting, bend forming, woven metal textiles, non-woven
metal textiles, selective laser melting, electron beam melting, and self-
propagating photopolymer waveguide method are among the
manufacturing processes mentioned.