MTS 315 User Manual

Series 315 Load Frame Product Information Manual

Model 315.01 Model 315.02 Model 315.03 Model 315.04

100-104-403 A

Trademark information MTS is a registered trademark of MTS Systems Corporation.

Contact information MTS Systems Corporation

14000 Technology Drive Eden Prairie, Minnesota 55344-2290 USA Toll Free Phone: 800-328-2255 (within the U.S. or Canada) Phone: 952-937-4000 (outside the U.S. or Canada) Fax: 952-937-4515 E-mail: info@mts.com http://www.mts.com

Publication information

Manual Part Number Publication Date

100-104-403 A

November 2002

Contents

Introduction 5

Component Identification 7

Functional Description 8

Specifications 10

Load Frame Dimensions 11

Floor Loading Footprint Dimensions 13

Load Frame Stiffness Calculation 14

Installation 17

Lifting and Moving Instructions 18

Connecting Cables 23

Connecting Hydraulics 24

Operation 25

Emergency Stop 25

Crush Point Hazards 26

Maintenance 27

Maintenance Intervals 28

Making Daily Inspections 29

Minimizing Rust 30

Methods for Various Surfaces 30

Checking the Accumulators’ Precharge 31

Series 315 Load Frame Contents

Contents

Series 315 Load Frame

Introduction

Contents Component Identification 7

The Series 315 Load Frames are designed to perform high-velocity tension or compression testing, high-frequency fatigue testing, as well as other tests. The load frame must be configured with optional actuators, servovalves, force transducers, grips, and other components from MTS Systems Corporation.

Functional Description 8 Specifications 10 “Load Frame Stiffness Calculation” on page 14

815

Rock Mechanics

Test System

Series 315 Load Frame Introduction

What you

need to know

This manual assumes that you know how to use your system controller. See the appropriate manual for information about performing any controller-related step in this manual’s procedures. You are expected to know how to do the following:

• Turn system electrical power on and off

• Turn hydraulic pressure on and off

• Manually adjust the actuator position

• Use your grips and fixtures

Related products The load frame includes other products. See the following product manuals

for product-specific information and maintenance procedures.

• The Series 111 Accumulator Product Information manual.

(part number 011-553-300)

• The Series 252 Servovalve Product Information manual

(part number 011-182-900)

• The Series 298 Actuator Manifold Product Information manual

(part number 011-563-103)

Introduction

Series 315 Load Frame

Component Identification

Retangular

Columns

Security

Door

Impact Resistant

Lexan Panel

Rock Mechanics

Test System

815

Hoist Rings

Rigid Fixed Crosshead

Accessory

Attachment

Plates

Fatigue Rated,

Single-ended, Double-acting

Actuator

Emergency Stop

Button

Vibration

Isolation Pads

Stiff Base

Plate

Series 315 Load Frame Introduction

Functional Description

The load frame is a stand alone testing structure. The following paragraphs describe the components shown on the illustration in the “Component

Identification” on page 7.

Load Frame The load frame has an integrated construction that provides high stiffness,

reducing deflection energy stored in the frame — ideal for testing brittle materials. The actuator is integrated into the base plate which decreases frame height and increases stiffness.

The integrated construction also provides a precision, parallel alignment between crosshead and actuator surface for proper specimen loading.

The load frame provides a large test area for uniaxial and triaxial testing. The front security door allows easy access to test space. The impact resistant Lexan panels in front and back allow observation of tests in progress and helps contain specimen fragments.

Actuator The actuator is a single ended, double acting design allows testing in

compression and tension. The actuator provides a 100 mm (4 in) actuator stroke for tests requiring large displacements.

Proprietary seal and bearing designs, which have set an industry standard for durability, ensure long life and performance. Direct-bonded polymer bearings reduce friction and maximize heat dissipation.

Transducers The load frame usually includes a force transducer and an LVDT (or other

Differential Pressure

∆P) Transducer

(

Internal Linear Variable

Differential Transformer

(LVDT)

displacement measurement device.

The ∆P transducer provides force readout without affecting load frame stiffness. The ∆P transducer is accurate to within ±1% of the calibrated

range at loads above 1000kN. It provides useful measure of external loads applied to specimens inside a triaxial cell, when conducting multiple failure state tests per ISRM. The output signal is conditioned at the Digital Controller for closed-loop control and data acquisition.

The LVDT is calibrated to full scale actuator travel to provide complete positioning control. The LVDT is used for specimen positioning and preloading, and measuring actuator displacement during the test. The output signal is conditioned at the Digital Controller for closed-loop control and data acquisition.

Introduction

Series 315 Load Frame

Servovalves Servovalves regulate the direction and flow of the hydraulic fluid to and from a

hydraulic actuator. The servovalve responds to the polarity and magnitude of the command signal generated by the controller.

Hydraulic distribution Hydraulic distribution includes a hydraulic manifold (also called an actuator

manifold or hydraulic service manifold) which controls the hydraulic pressure to the load frame. The manifold includes solenoid valves that control the hydraulic pressure (off, low, or high). An actuator manifold is mounted directly to the actuator on the load frame. A hydraulic service manifold (HSM) is located near the load frame and connects to the actuator with hydraulic hoses.

Most hydraulic distribution systems will also include a check valve in the return line. The purpose of this check valve is to minimize actuator drift where pressure is present on the return line without servo control of the 315 frame.

Series 315 Load Frame Introduction

Specifications

Compression rating

kN 1600 2700 4600 4600

kip 350 600 1000 1000

Model 315.01 Model 315.02 Model 315.03 Model 315.04

Tension rating

kN 1050 1350 2300 2300

kip 240 300 500 500

Actuator displacement

mm 100 100 100 100

in 4444

Load frame spring rate

†

N/m

lb/in

Parallel alignment between platens

mm 0.051 0.051 0.051 0.051

in 0.002 0.002 0.002 0.002

Weight

kg 2359 3855 6350 7590

lb 5200 8500 14,000 16,700

7. 0 x 10

4.0 x 10

9.0 x 10

5.0 x 10

11.0 x 10

6.3 x 10

10.5 x 10

6.0 x 10

Floor Load (using four102 x 152 mm (4 x 6 in.) vibration

isolation pads)

‡

kPa 380 614 1007 1200

psi 55 89 146 174

* Although the Load Frame assembly is capable of producing the indicated force in tension, the actual

tensile force limit is dependent on the attachment hardware (e.g., threaded connectors) that attach the gripping fixtures to the crosshead and actuator.

† See “Load Frame Stiffness Calculation” on page 14 for the method used to determine load frame

spring rate.

‡ See the figure and table below for the floor loading footprint dimensions.

Introduction

Series 315 Load Frame

Load Frame Dimensions

Model 315 Load Frame Dimensions

815-315-02

Series 315 Load Frame Introduction

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