Testing of High Strength Synthetic Ropes - Samson Rope

Present Testing StandardsCI-1500 – Test Methods for Fiber RopeASTM4268 – Standard Test Methods forTesting Fiber RopesEN919* – Fiber Ropes for General Service –Determination Of Certain Physical AndMechanical PropertiesISO/DIS 2307 – Ropes – Determination ofCertain Physical and Mechanical PropertiesOCIMF - Prototype Rope Testing*Note: EN 919 replaces BS 4928

Detailed Comparison of Testing StandardsStandardType of rope it pertains toSRT CI-1500AllASTM 4268ISO/DIS 2307Nylon, PET, PP,PE, NatureBS 4928(refer to BS 5053)3 - PET or nylon8 - PET or nylondouble braided -nylonEN-919AllInitial Tensionlb =200 d2refer to table NA NAPre Test CyclesNylonPolyesterHigh Modulus10@20%;10@50% forhighperformance10@20%10@50% optional10 at 20%NoneNoneNoneTesting speedcycle to 20%in 2 - 200 secNA75+/-25mm/MinStrengthbreaking strengthsAllows 10% to meet spec.Allows calculation from yarns with realization factorsLinear density @ tensionlb = 200 d2 Lb = 50 d2 lb = 200 d2 Refer to table t(kg) = D2/8 t(kg) = D2/8NoteSpliced sample if possiblecan overestimate strength:1. Capstan break2. 10% addition3. Realization factor computation

Properties of TextilesDyneemaSk-75Nylon(Type 66) PolyesterVectran(T-150)Manufacturer DSM Dupont Allied CelaneseTenacity (gpd) 39 9.8 9.2 23-26Elongation 3.80% 18.70% 14% 3.3 - 3.7%Spec. Gravity 0.97 1.14 1.38 1.4Per manufacturer's specifications

Ropeconstruction½“ dia

SRT Test Machine Specifications Capacity: Dimensions: Length: Speed:4000lb - 1.1 MM lb106 ft. long x 6 ft. wide50ft with 16 ft stroke0-12 ft/min up to 100,000 lbs0-10 ft/min up to 275,000 lbs0-2 ft/min up to 1.1 MM lbs Capabilities:• Automated Cycle Loading• Precise Elongation Measurements• Computer Controlled• Data Acquisition, Storage, Calculations &Results Reporting

Samson 1.1 MM lb. Test Machine

Pre-cycling the Rope Before BreakingPre-cycling to “set”the ropeNote the“constructionalelongation”Load, lb500000400000300000200000100000Condition the rope to "set" construction055 60 65 70ElongationGauge measurements, inchFinal breaking ofrope after the 10 thcycleLoad, lb1,200,0001,000,000800,000Testing of ASB Rope600,000400,000200,00000 10 20 30 40 50 60 70 80Gauge, Elongation inches

Synthetic Rope TestingPolyester Rope with and without precyclingNo Cycle20% cycle12000120001000010000Strength, lb800060004000Strength, lb8000600040002000200000 5 10 15 20 25Elongation, %50% Cycle00 5 10 15 20 25Elongation, %12000Strength, lb100008000600040002000Polyester Rope Strength, lbNo cycling 10,22120% cycling 11,04850% cycling 11,14600 5 10 15 20 25Elongation, %

Synthetic Rope TestingNylon Rope with and without precyclingNo cycle20% Cycle12000120001000010000Strength, lb800060004000Strength, lb8000600040002000200000 5 10 15 20 25Elongation, %00 5 10 15 20 25Elongation, %50% cycle12000Strength, lb100008000600040002000Nylon Rope Strength, lbNo cycling 11,56520% cycling 10,43650% cycling 10,19600 5 10 15 20 25Elongation, %

Synthetic Rope TestingVectran Rope with and without precyclingNo Cycle20% Cycle350003500030000300002500025000Strength, lb200001500010000Strength. lb2000015000100005000500000 2 4 6 8Elongation, %00 2 4 6 8Elongation, %50% CycleStrength, lb3500030000250002000015000100005000Vectran rope Strength, lbno cycle 32,60020% BS 34,90050% BS 37,20000 2 4 6 8Elongation, %

Synthetic Rope Testing – HMPE ropeDamping effect – low stress/strain lagging600000Stress Strain5000004000003000002000001000000Time

Synthetic Rope Testing – Nylon ropeSome Phase Lag5 10 15 20 25 30TimeStress Strain

Synthetic Rope TestingStrength Data ComparisonASB PTS Tenex Validator 12Spec. Avg. 32,600 11,250 11,800 35,000no cycle 31,800 10,200 10,200 32,60020% BS 32,700 11,000 11,100 34,90050% BS 34,700 11,100 11,200 37,200

CONCLUSIONS• Rope strength and total elongation arefunction of how they are measured• Data collected so far show consistent trend ofthe effects of pre-cycling of high modulus fiberropes• High elasticity fiber may result strain-stressphase lag• Real time elongation measurement isimportant to understand dynamic ropebehaviors• For some fibers 10 cycles does not remove allthe constructional elongation