abs inclinometer casing test report 1999. 11. 21 dong-a geo van co.,ltd
TRANSCRIPT
ABS INCLINOMETER CASING TEST REPORTABS INCLINOMETER CASING TEST REPORT
1999. 11. 21
Dong-A Geo van Co.,Ltd
INTRODUCTION
Main feature of ABS tubes
Non-corrosion plastic agent
Flexible than Aluminum tube
High impact strength and light weight
Strong support by 400mm long length coupling
Site Operation FigSite Operation Fig Cross-SectionCross-Section
A A
(Section “A-A”)
CAUSE OF DAMAGE
ABS inclinometer casing damaged by external force :
As the misalignment of borehole and ABS inclinometer casing during installation, it happened big
radial stress to the casing. Sometimes soft soil layer (ex, silt or sand) would affect lateral movement exce
ssively.
ABS inclinometer casing damaged by axial force :
Due to too much load to the top edge part of casing , The casing would be broken by axial direction.
PHENOMENON
Applied load to install casings Broken to the axial direction
Broken by external stress
ABS RESIN TEST RESULT
Mechanical Properties
Tensile ModulusStress at YieldStrain at YieldStress at BreakStrain at Break
Flexural ModulusFlexural StrengthFlexural Strain
Impact strength notch IzodImpact strength notch IzodHardness RockwellCoefficient of friction1
ASTM D638 1mm/min 50mm/min 50mm/min 50mm/min 50mm/min
ASTM D790 2.8mm/min 2.8mm/min 2.8mm/min
ASTM D256 . ¼″ 23℃ASTM D256 . ¼″ 0/－ 30 ℃ASTM D785 . RASTM D2240
Physical Properties
Specific gravityMelt flow rateWater absorption
ASTM D792ASTM D1238 230 / 38N℃ASTM D570
㎤ /gmg/10min%
MPAMPA %MPA %
MPAMPA㎜
J/mJ/m
2215 1910 47 39 3.0 2.8 34 27 11 32
21506211.0
265236/119110.0
1.0501.07
Remark) BASF Lab test result
PROCESSING
Processing Properties /Extrusion
Barrel temp. rearBarrel temp. midBarrel temp. frontDie temp
Injection pressureHolding pressureBack pressure
Mold shrinkageMold temperatureRecommended drying timeMaterial drying tempScrew Speed
ASTM D955
℃℃℃℃
BarBarBar
㎝ /㎝ ×10-³℃hr℃rpm
Min Max 200 220210 220220 230220 230
0.0077 2 70
Remark) BASF Lab test result
PRODUCT ANALYSIS
Modeler :Hyper Mesh Ver 3.0
Analysis Code : ABAQUS/Standard Ver 5.8
Specimen : Outer Diameter Φ70, Thickness 4.0 mm ABS Inclinometer Casing
Analysis model : The cross-section of casing is symmetry.
To record data after applied force equally to the 1/4 casing section. Refer to below Fig.
Applied force : External distribution force from 3bars ~ 16 bars to 1/4 casing section.
Evaluation : Checked maximum endurance break point of casing wall when the applied force being given.
Analysis Tool
<tube cross-section> <1/4 specimen section>
Applied force
ANALYSIS RESULT I
Deformation Shape
Before deformation
(Red color)
After deformation
Input pressure : 16 bar Max Deformation : 0.3 mm
ANALYSIS RESULT II
VON-MISES Stress Distribution
Input pressure : 16 bar Max Stress : 4.78 kgf/mm2
Stress concentration
Area
ANALYSIS RESULT III
Deformation - Stress Curve
( X axial deformation in maximum deformation area)
Stress
concentration
(kgf/mm2)
Pressure-Stress Curve
0
100
200
300
400
500
600
0 2 4 6 8 10 12 14
External Pressure (bar)
Stre
ss (
kg/c
m̂2)
ANALYSIS RESULT IV
This graph shows maximum stress to the casing in the interval of 3bars.
VON
MISES
STRESS
(kg/cm2)
CONCLUSION
This report is to write maximum endurance break point of casing wall when the applied force being
given under same conditions.
→ ABS inclinometer casing made by BASF Resin grade in case of outer diameter Φ70, wall
thickness 4.0 mm could endure maximum load up to 640kgf.
Top edge of ABS inclinometer casing damaged to the axial direction is not common but we may
guess below ;
As strain at break at normal temperature is 11 %, ABS resin itself has no influence on casing damage.
However it would sometimes results from unusual stress concentration at rib area and weak molecular
union during work under high temperature and low pressure.
The basic chemical resin of ABS inclinometer casing are robust since high modulus of BASF grade
made of balanced properties having high strength, modulus, and durability.
Therefore the end user has to consider optimized installation way before use.