CHARACTERIZATION AND ANALYSIS OF MECHANICAL PROPERTIES FOR 3D PRINTING MATERIALS

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 09 Issue: 03 | Mar 2022 www.irjet.net p-ISSN: 2395-0072
© 2022, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 62
CHARACTERIZATION AND ANALYSIS OF MECHANICAL PROPERTIES
FOR 3D PRINTING MATERIALS
MAKKA JAYAKRISHNA1, HANUMANTHU SAI SANTOSH2
1M. Tech student, Mechanical Engineering, GMRIT ENGINEERING COLLEGE, Rajam, A.P, INDIA.
2B. TECH Student, Mechanical Engineering, GMRIT ENGINEERING COLLEGE, Rajam, A.P, INDIA.
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Abstract - The recent developments in the 3D printing
technology enables the digital manufacturing In mass-scale
distribution and also the ready availability of 3D printers for
the public at lowcostsand high mechanical properties makes
the scientists to look at the properties of the
3Dprintingmaterials.However, to make 3D objects polymers
are mainly used which generally have low mechanical
properties. So, that there is an urgent need to charecteriseand
analyze the mechanical properties to assesswhich3D printing
materials have better properties. This work is aimed to find
the best 3D printing material from existing materials. In this
work, initially the mechanical properties of the 3D printing
polymers like polylactic acid (PLA), Lay Wood have been
analyzed. This work would propose the best 3D printing
material from current basic 3D printing materials with
improved mechanical properties.
Key Words: PLA, SLA, MJP, SOUP, SLS, CJP, LENS.
1.INTRODUCTION
IMPORTANCE OF 3 D PRINTING: As the world is more
advancing day by day given technology, the constraints like
time, dimensional accuracy, surface finish etc are playing a
major role in the industrial territory as the conventional
machining process are not solving these problems. For ease
in their life people are also looking into the productionofthe
parts which are small in size and used often. As need and
necessity leads to discovery, engineers looked into a
manufacturing process called Additive Manufacturing to
assure the needs of the people and industries
3D Printing is a process where physical objectsareprepared
by laying down many successive thin layers of material. It
converts a digital data of the object into physical form by
adding layer by layer of material. The basic principle
behindthe3D Printing is additive manufacturing where
objects are prepared by joining materials to make objects
from 3D model data. Additive manufacturing technology
which is a combination of many manufacturing process that
makes any product possible to make and eliminates many
constraints imposed by conventional manufacturing which
leads to more futuristic market opportunities. It is also
known as the Rapid Prototyping where it is used to quickly
fabricate a scale model of a physical part using three-
dimensional CAD data.
TYPES:
There are so many times of additive manufacturing process
but mainly classified into three types based on the initial
form of its material, they are:
1)Solid based AM
2)Liquid based AM
3)Powder based AM
1.1 SOLID BASED ADDITIVE MANUFACTURING:
The building material used in this type is in solid state. The
solid form can include the shapes like wire, rolls, laminates
and pellets (expect powder). This method is mostly used
compared to powder based.
Examples:
1) Fused deposition modeling (FDM)
2) Selective deposition Lamination (SDL)
3) Laminated Object Manufacturing (LOM)
4) Ultrasonic Consolidation
1.2 LIQUID BASED ADDITIVE MANUFACTURING:
The building material used in this type is in liquid state. This
method is mostly used compared to solid based. Examples:
1) Stereo lithography Apparatus (SLA)
2) Multi-jet Printing (MJP)
3) Poly jet 3-D Printing
4) Solid Object Ultraviolet-Laser Printer (SOUP)
5) Rapid Freeze Prototyping
1.3POWDER BASED ADDITIVE MANUFACTURING: The
building material used in this type is in powder state. This
method is mostly used compared to solid based. Examples:
1) Selective Laser Sintering (SLS)
2) Color Jet Printing (CJP)

3) Laser Engineered Net Shaping (LENS) 9
4) Electron Beam Melting (EBM) etc.
2. LITERATURE REVIEW
Tymrak B.M et al(2014) studied the basic tensile strength
and elastic modulus of printed components using realistic
environmental conditions for standardusersofa selectionof
open-source 3-D printers. The results find average tensile
strengths of 28.5 MPa for ABS and 56.6 MPa for PLA with
average elastic moduli of 1807 MPafor ABS and 3368 MPa
for PLA. It is clear from these results that parts printed from
tuned, low-cost. Rep Rap printed parts to be used in
engineering applications the mechanical properties of
printed parts are well known [1].
Joshua M. Pearce et al (2003) studied on Rep Rap printed
parts printed in realistic environmental conditions that can
match and even perform commercial 3-Dprintersusing
proprietary FDM in terms of tensile strength with the same
polymers. Tensile strengths of the large sample set of Rep
Rap prints fluctuated. This study determines the effect of
color and processing temperature on material properties of
Lulzbot TAZdeposited PLA in various colors. Five colors
(white, black, blue, grey, and natural) of commercially
available filament processed from 4043D PLA is tested for
crystallinity withXRD,tensilestrengthfollowingASTMD638
and the micro-structure are done with environmental
scanning electron microscope [2].
Lu Wang et al (2014) studied on investigation of two
printing parameters, layer height (0.2and0.4 mm)andplate
temperature (30 and 160 °C) on the Izod impact strength of
printed PLA.X-ray diffraction (XRD) analysis confirmed the
existence of α crystals in parts printed from 160 °C-plate
temperature and α' crystals in those printed at 30 °C plate
temperature. Parts printed with a 160 °C (plate
temperature) had higher crystallinity. Polarized optical
microscope (POM) observations illustrated that the plate
temperature of 160 °C and layer height of 0.2 mm induced
higher crystallinity, smaller crystals and inter facial crystal
bands. The Izod impact strength of printed PLA at higher
plate temperature was up to 114% higher than injection
molded PLA made using conventional molding parameters
[3].
Ossi Martikka1 et al (2018) studied on tensile properties
and impact strength of two3D-printed commercial wood-
plastic composite materials are studied and compared to
those made of pure poly lactic acid. Relative to weight –
mechanical properties and the effect of the amount of fill on
the properties. This results indicate that parts made of 11
wood-plastic compositeshavenotablylowertensilestrength
and impact strength that those made of pure poly lactic acid
and mechanical properties can be considered sufficient for
low-stress applications, such as visualization of prototypes
and models or decorative items [4].
Cezary Grabowikl et al (2002) studied of tensile tests
carried out for specimens made of the selected group of the
filament materials. The selected group of the filament
materials involved the group of wood, PLA. Herein, it should
be noticed, that technical data sheets that are delivered by
filament materials producers include data that are valid for
only one specific printing direction.Thisprintingdirection is
deliberately selected, in such way that ensures the best
material characteristics. This research results allowtomake
comparison between a catalogue data and data obtained in
the printing process [5].
TABLE NO-01: SPECIFICATONS OF 3D PRINTER
Build volume 300*300*400 mm
LCD screen Yes
Nozzle diameter 0.4(can be replaced to
0.3/0.2mm)
Nozzle temperature Below 250℃ In normal
state, max. 270℃
Support filaments ABS/PLA/TPU and so on
Material diameter 1.75mm
Print speed 150mm/sec
File Format G-Code, JPG, OBJ, STL
Host computer software Cura
Other features SD card off line printing
function
FIG 1: CREALITY 10-S 3-D PRINTER
RESULTS
The specimens made from both the materials PLA and Lay
wood are tested for tensile strength and Compressive
strength using Universal testing machine. The tensile
strength for the PLA is given in the table below.

TABLE NO-2: TENSILE STRENGTH OF PLA
FIG NO-02: TENSILE SPECIMEN OF PLA AFTER THE TEST
The tensile strength results for lay wood is given in the table
below
TABLE NO-3: TABLE SHOWING TENSILE STRENGTH OF
LAY WOOD
FIG NO-3: STRESS-STRAIN GRAPH OF PLA
And like the tensile strength, the compressive strength is
also find out using Universal testing machine (UTM)
The compressive strength of PLA is given in the below table
TABLE NO-4: COMPRESSIVE STRENGTH AND IMPACT
STRENGTH OF PLA
FIG NO-04: COMPRESSIVE STRENGTH TESTING OF PLA
USING UTM
Lay wood compressive strength is given below in the table
TABLE NO-5: TABLE SHOWING COMPRESSIVE
STRENGTH AND IMPACTSTRENGTH OF LAY WOOD
Now using the Rockwell hardness testing machine, wefound
out the hardness of the two materials. Thediamondindenter
of 1/4 inches and B scale is used.
The harness values of PLA are given in the table below
TABLE NO-6: TABLE SHOWING HARDNESS VALUES OF
PLA
The hardness values of Lay wood are given in thetablebelow

TABLE NO-7: TABLE SHOWING HARDNESS OF LAY
WOOD
The nodularity and porosity of the materials aredetermined
by using Electron microscope and using MICROCAM 4.0
software.
The result of nodularity for Lay wood is given in the below
details
FIG NO-05: SHOWING THE MICROSTRUCTURE OF LAY
WOOD MATERIAL
TABLE NO-8: SHOWING THE PERCENTAGE OF
NODULARITY IN LAYWOOD
GRAPHS SHOWING THE VARIATION BETWEEN
NODULARITY AND NONNODULARITY
The porosity of Lay wood is tested and given below.
FIG NO-06: SHOWING THE MICRO STRUCTURE OF
LAYWOOD

TABLE NO.9 TABLE GIVING THE POROSITY PERCENTAGE
OF LAY WOOD
GRAPH BETWEEN POROSITY AND NON-POROSITY OF
LAY WOOD
FIG NO-07: SHOWING THE MICRO STRUCTURE OF LAY
WOOD AFTER FINDING POROSITY
The result of nodularity for PLA is given in the below
details
FIG NO-08: SHOWING THE MICROSTRUCTURE OF PLA
MATERIAL
TABLE NO-10: SHOWING THE PERCENTAGE OF
NODULARITY IN PLA
GRAPHS SHOWING THE VARIATION BETWEEN
NODULARITY AND NONNODULARITY

The porosity of PLA is tested and given below.
FIG NO-09: SHOWING THE MICRO STRUCTURE OF PLA
TABLE NO-11: TABLE GIVING THE POROSITY
PERCENTAGE OF PLA
GRAPH BETWEEN POROSITY AND NON-POROSITY OF
PLA
From the work it is established that PLA is more useful than
the Lay wood. Hence an extra test to know the composition
of the material is done for PLA using X-ray
Diffraction method (XRD).

FIG NO:10 GRAPH SHOWING THE PEAK POINT OF
COMPOSITION IN PLA MATERIAL DETERMINED USING
XRD
3. CONCLUSIONS
In this work, results of the mechanical properties of PLAand
Lay Wood have been compared. The tensile strength of PLA
is 42.9 N/mm2 and for Lay wood is 29.6 N/mm2 which is
less than the tensile strength of PLA. The compressive
strength is approximately similar with values for PLA 26
N/mm2 and for Lay wood 25.5N/mm2. Theimpactstrength
of these materials is nearly equal to zero and coming to the
hardness Lay wood have less hardness than PLA withvalues
for Lay wood it is 80 and for PLA it is 95. As the nodularity
percentage is more for both the materials there are
considered to be brittle and hard and porosity of PLA is less
than the Lay wood porosity which makes PLA surface
smooth.
The results showed that PLA is more applicable thantheLay
wood because of its mechanical properties.Fromthiswork it
is found that these both materials cannot be used in sudden
load applications because of their impact strength is nearly
equal to 0. It is also observed from this work that the PLA
material does not need much post processing before
releasing into market for surface finish because of less
porosity.
In this way this work is useful for predicting the mechanical
properties of 3D sprinting materials before making the
objects in the industries. This work is very useful for
managers and manufacturers of 3D printing materials.
REFERENCES
[1] Lalit Singh Mehta,Dr.PriamPillai,CompressionTestingof
PLA in 3D Printing, International Journal of Electronics,
Electrical and Computational System, Vol 6, PP. 68-69,2017.
[2] Annamalai Pandian, Cameron Belavek, American Society
for Engineering Education, PP. 1-3,2016
[3] Juraj Beniakl, Milos Matusi and Peter Krizan,
Biodegradable Polymers for the Production of Prototypes,
Vol 832, PP. 152-158, 2016
[4] Martikka Ossi, Timo Karki and Qingling Wu, Mechanical
Properties of 3DPrinted Wood-Plastic Composites, Trans
Tech Publication, Vol 777, PP. 499-507, 2018
[5] Durgun Ismail and Ertan Rukiye, Experimental
investigation ofFDMprocess forimprovementofmechanical
properties and production cost, Rapid Prototyping Journal,
Vol. 20, PP. 228 - 235, 2014.
[6] Tymrak B.M, Kreiger M, Pearce J.M, Mechanical
Properties of components fabricated with open-source 3D
printers under realistic environmental conditions, Vol 8, PP.
242-246, 2014.
[7] Lee I and Kim Y, The Recent Patent Analysis and
Industrial Trend of 3D Printing, IndianJournal ofScience and
Technology, Vol 8(S8), PP. 70-73, 2015.
[8] Godfrey C.Onwubolu and Farzad Rayegani,
Characterization and Optimization of Mechanical Properties
of ABS Parts Manufactured by the Fused Deposition
Modelling Process, International Journal of Manufacturing
Engineering, Vol 2014, PP.13, 2014.
[9] Es-Said O. S, Foyos J, Noorani R, Mendelson M, Marloth R
& Pregger B.A, Effect of Layer Orientation on Mechanical
Properties of Rapid Prototyped Samples, Vol 15, PP. 107-
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