Release notes are available for the following releases of CONTACT:

CONTACT Release v16.1
CONTACT Release v15.1
CONTACT Release v14.1
CONTACT Release v13.1
CONTACT Release v12.2
CONTACT Release v12.1
CONTACT Release v11.1
CONTACT Release v10.2
CONTACT Release v10.1
CONTACT Release v9.1

Release Notes for version 16.1: August, 2016

CONTACT v16.1 provides the following extensions with respect to earlier versions of the program:
  • The main change in the program itself concerns extension and speed-up of the subsurface stress calculation.
  • Further the CONTACT library has been improved and is now provided integrated in Universal Mechanism.
For more information refer to the full release notes (pdf-format).

Release Notes for version 15.1: October, 2015

CONTACT v15.1 provides the following extensions with respect to earlier versions of the program:
  • Added a fast solver TangCG for transient sliding and rolling contact [Zhao2015a].
  • Providing the computational core of CONTACT as a library, with a MATLAB® interface.
For more information refer to the full release notes (pdf-format).

Release Notes for version 14.1: December, 2014

CONTACT v14.1 is a minor update that provides mainly small improvements and bug-fixes:
  • More complete overview of input-data written to output-file.
  • Added option O=1 for reducing the size of the output-file.
For more information refer to the full release notes (pdf-format).

Release Notes for version 13.1: September, 2013

CONTACT v13.1 includes the following modifications with respect to earlier versions of the program:
  • Extensions for solving conformal contact problems, particularly between the wheel flange root and rail gauge corner.
  • Further speed-up of the normal contact solver, particularly for situations with prescribed normal force.
  • Improvements with respect to presentation of the results.
For more information refer to the full release notes (pdf-format). The first item is presented in the paper [Vollebregt2014d].

Release Notes for version 12.2: June, 2012

CONTACT v12.2 includes the following modifications with respect to earlier versions of the program:
  • Improved capabilities for reproducing measured creep force curves, via a model for the third body layer and velocity dependent friction laws.
  • Interesting results with respect to the effects of velocity dependent friction in transient simulations.
  • Substantial improvements with respect to the ease of use and documentation of the program.
For more information refer to the full release notes (pdf-format). The first item is presented in the papers [Vollebregt2014c] and [Vollebregt2012b]. The second item is the subject of [Vollebregt2012a].

Release Notes for version 12.1: January, 2012

CONTACT v12.1 includes the following modifications with respect to earlier versions of the program:
  • Achieved a 100-fold speedup for solving larger normal contact problems.
  • Improved the documentation of the viscoelastic part of CONTACT and provided an example of its use.
  • Distinguished free and premium features in the software, the latter requiring a valid license file.
For more information refer to the full release notes (pdf-format).

Release Notes for version 11.1: April, 2011

CONTACT v11.1 includes the following modifications with respect to earlier versions of the program:
  • Added a full wheel-rail example: S1002 on UIC60, conform the Manchester benchmark problem.
  • Added provisions for investigation of more detailed friction laws, such as velocity dependent friction.
  • Made several performance improvements. In total, many smaller test cases can now be solved in 3 to 30 msec per case.
  • Improved the CONTACT GUI such that it works on the Linux platform as well.
For more information refer to the full release notes (pdf-format).

Release Notes for version 10.2: October, 2010

CONTACT v10.2 includes the following modifications with respect to earlier versions of the program:
  • Added an installer for the Windows platform, and a plain graphical user interface, the CONTACT GUI.
  • Added detailed control over the undeformed distance of the two bodies, and an example for transient rolling problems.
  • Implemented a new iterative solver "SteadyGS" for the steady state rolling problem.
  • Resolved a problem in the calculation of problems for bodies with dissimilar materials.
For more information refer to the full release notes (pdf-format). The SteadyGS solver is presented in the paper [Vollebregt2010c].

Release Notes for version 10.1: January, 2010

CONTACT v10.1 includes the following modifications with respect to earlier versions of the program:
  • Added the FASTSIM algorithm for quickly approximating the tangential stresses.
  • Speed-up of the computations using parallelisation on multi-core PC's.
  • Improved input-options for the subsurface stress calculation, with an example and a plot-routine.
  • Allow for comments in and improved handling of the user input file, provide more control over the progress output.
For more information refer to the full release notes (pdf-format).

Release Notes for version 9.1: October, 2009

CONTACT v9.1 includes the following modifications with respect to earlier versions of the program:
  • Improved leading edge boundary condition, avoiding spurious oscillations when larger time steps are used.
  • Allow larger problems to be solved, by dynamic memory allocation and matrix-free implementation of the solution algorithms.
  • Improved flexibility of the program, by introducing the experiment name; improved error-handling with respect to the user input.
  • Improved the internal structure and extendability of the program, a.o. by introducing a (Fortran90) hierarchical data-structure.
The first two items are described in the paper [Vollebregt2009a].