Compression experiment and numerical evaluation on mechanical responses of the lattice structures with stochastic geometric defects originated from additive-manufacturing

Cao, Xiaofei; Jiang, Yuesong; Zhao, Tian; Wang, Panding; Wang, Yongzhen; Chen, Zihao; Li, Ying; Xiao, Dengbao; Fang, Daining

doi:10.1016/j.compositesb.2020.108030

Cited by 102 publications

(46 citation statements)

References 30 publications

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“…To evaluate the EA capacity of the superimposed lattice structure, it is necessary to consider the EA and specific EA (SEA) of the superimposed lattice structure. [ 24,29 ] The EA per unit volume is the area enclosed by the stress and strain curves, integrated within the strain range to obtain the EA of the superimposed structure of different diameters. The expression is

EA = \int_{0}^{ε_{0}} σ d ε

where σ and ε are the compressive stress and strain, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Mechanical Characteristics of Superimposed 316L Lattice Structures under Static and Dynamic Loading

Chang

Zhang

et al. 2021

Adv Eng Mater

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Additive Manufacturing (AM) discrete patterns made of stainless steel 316 L offer potential energy absorption for engineering applications, including blast and impact protection systems and aircraft structure. Herein, three different superimposed stainless steel 316 L lattice structures varying rod diameter are manufactured by selective laser melting (SLM). Compression experiments and split Hopkinson pressure bar (SHPB) tests are conducted to determine the quasi‐static and impact behavior of different lattice structures for the strain rate from 10−3 to 1000 s−1. The compressive response, strain rate dependency, and energy absorption capacity of the lattice structures are mechanically characterized. In addition, numerical simulations are conducted to complement the experimental work in which the deformation modes of the lattice under mechanical responses have been studied. The results indicate that vertical truss in structure plays a bearing role in the whole process of compression, which is better than inclined truss structures. Due to the combined effect of two deformation modes in the superimposed structure, it has shown superior energy absorption capacity compared with other structures. The superiority of the superimposed structure provides a new idea for the design of lattice structure.

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EA = \int_{0}^{ε_{0}} σ d ε

where σ and ε are the compressive stress and strain, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The serious geometric defects in the horizontal trusses will directly affect the mechanical properties of the superimposed lattice structure. [ 24 ] Consequently, the horizontal trusses will be removed and replaced by more inclined trusses to increase the integrity of structure.…”

Section: Lattice Materials and Manufacturementioning

confidence: 99%

Mechanical Characteristics of Superimposed 316L Lattice Structures under Static and Dynamic Loading

Chang

Zhang

et al. 2021

Adv Eng Mater

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“…Established methods opt for one single strut ‘as-built’ which are gripped or fixed at each end so as to avoid slipping at the grip/strut interface [2] , [7] , [12] , [13] . However a ‘group’ of struts in lieu of the gauge section can also be used [16] , [17] and sometimes gripping ‘tabs’ are printed on the end [18] , [19] . Strain has been measured in various ways.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and morphological properties of additively manufactured SS316L and Ti6Al4V micro-struts as a function of build angle

Hossain

Ghouse

Nai

et al. 2021

Additive Manufacturing

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Additive manufacturing methods such as laser powder bed fusion (PBF) can produce micro-lattice structures which consist of ‘micro-struts’, which have properties that differ from the bulk metal and that can vary depending on the orientation of the strut to the build direction (the strut build angle). Characterizing these mechanical and morphological changes would help explain macro-scale lattice behavior. Individual stainless steel (SS316L) and titanium alloy (Ti6Al4V) laser PBF struts were built at 20°, 40°, 70° and 90° to the build platform, with 3 designed diameters and tested in uniaxial tension (n = 5). Micro-CT was used to quantify changes in surface roughness, eccentricity and cross-section. Average elastic modulus was 61.5 GPa and 37.5 GPa for SS316L and Ti6Al4V respectively, less than the bulk material. Yield strength was uniform over build angle for SS316L, but for Ti6Al4V varied from 40% to 98% of the bulk value from 20° to 90° build angles. All lower angle struts had worse morphology, with higher roughness and less circular cross-sections. These data should help inform micro-lattice design, especially in safety critical applications where lower mechanical performance must be compensated for.

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“…As observed in the figure, the largest detriment of this print is the outer surface roughness and residue powder, which was not improved after 35 min of ultrasonic cleaning. Recent studies have been conducted on the design and testing of lattices fabricated by SLM [146,147]. In particular, a cubic lattice design was topologically optimized to show increased mechanical properties and energy absorption capabilities [148].…”

Section: Selected Laser Sintering/melting (Sls/slm)mentioning

confidence: 99%

“…In particular, a cubic lattice design was topologically optimized to show increased mechanical properties and energy absorption capabilities [148]. Along with enhanced topology, the implemented improvements include optimizing the printing param- Recent studies have been conducted on the design and testing of lattices fabricated by SLM [146,147]. In particular, a cubic lattice design was topologically optimized to show increased mechanical properties and energy absorption capabilities [148].…”

Section: Selected Laser Sintering/melting (Sls/slm)mentioning

confidence: 99%

Additive Manufacture of Small-Scale Metamaterial Structures for Acoustic and Ultrasonic Applications

et al. 2021

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Acoustic metamaterials are large-scale materials with small-scale structures. These structures allow for unusual interaction with propagating sound and endow the large-scale material with exceptional acoustic properties not found in normal materials. However, their multi-scale nature means that the manufacture of these materials is not trivial, often requiring micron-scale resolution over centimetre length scales. In this review, we bring together a variety of acoustic metamaterial designs and separately discuss ways to create them using the latest trends in additive manufacturing. We highlight the advantages and disadvantages of different techniques that act as barriers towards the development of realisable acoustic metamaterials for practical audio and ultrasonic applications and speculate on potential future developments.

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Compression experiment and numerical evaluation on mechanical responses of the lattice structures with stochastic geometric defects originated from additive-manufacturing

Cited by 102 publications

References 30 publications

Mechanical Characteristics of Superimposed 316L Lattice Structures under Static and Dynamic Loading

Mechanical Characteristics of Superimposed 316L Lattice Structures under Static and Dynamic Loading

Mechanical and morphological properties of additively manufactured SS316L and Ti6Al4V micro-struts as a function of build angle

Additive Manufacture of Small-Scale Metamaterial Structures for Acoustic and Ultrasonic Applications

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